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{{short description|Modern Japanese martial art}}
{{About|a modern Japanese martial art|the cybersecurity company|Aikido Security}}
{{Use dmy dates|date=January 2020}}
{{Infobox martial art
| logosize = 40px
| image = Shihonage.jpg
| imagecaption = A version of the "four-direction throw" ({{transliteration|ja|shihōnage}}) with standing attacker ({{transliteration|ja| Uke}}) and seated defender ({{transliteration|ja|Tori}})
| imagesize = 300px
| imagealt = A man kneeling throws another man from a standing position; both are wearing robes
| name = Aikido
| aka =
| focus = [[Grappling]] and [[Hard and soft techniques#Soft technique|softness]]<!-- see the many discussions at Talk:Aikido -->
| hardness = Full contact
| country = Japan
| creator = [[Morihei Ueshiba]]
| famous pract = [[Kisshomaru Ueshiba]], [[Moriteru Ueshiba]], [[Koichi Tohei]], [[Christian Tissier]], [[Morihiro Saito]], [[Akira Tohei]], [[Yoshimitsu Yamada]], [[Mitsunari Kanai]], [[Gozo Shioda]], [[Mitsugi Saotome]], [[Steven Seagal]], [[Takashi Kushida]], [[Kyoichi Inoue]], [[Robert Mustard]], [[Fumio Toyoda]]
| parenthood = 
| ancestor arts = [[Daitō-ryū Aiki-jūjutsu]]
| descendant arts = [[Jieitaikakutojutsu]]
| olympic =
| website =
}}
'''Aikido''' ({{small|[[Shinjitai]]:}} {{lang|ja|[[wikt:合気道|合気道]]}}, {{small|[[Kyūjitai]]:}} {{lang|ja|[[wikt:合氣道|合氣道]]}}, {{transliteration|ja|aikidō}}, {{IPA|ja|aikiꜜdoː}}) is a [[gendai budō|modern Japanese martial art]] which is split into many different styles including [[Aikikai]], [[Shodokan Aikido]], [[Yoshinkan]], [[Renshinkai]], [[Iwama Ryu]], [[Iwama Shin Shin Aiki Shuren Kai]], and [[Ki Aikido]]. Aikido is now practiced in around 140 countries.<ref>{{Cite web |title=About Aikido |url=http://www.aikikai.or.jp/eng/aikido/about.html |access-date=2025-09-21 |website=Aikikai Foundation |quote="Sixty years have passed since the spread of Aikido overseas began. During this time, Aikido has become established in 140 countries."}}</ref> 

It was originally developed by [[Morihei Ueshiba]], as a synthesis of his martial studies, philosophy and religious beliefs. Ueshiba's goal was to create an art which practitioners could use to defend themselves against attacks, while also protecting the attackers from injury.<ref>{{cite book |last=Sharif |first=Suliaman |title=50 Martial Arts Myths |publisher=New Media Entertainment |year=2009 |page=135 |isbn=978-0-9677546-2-8}}</ref><ref>{{cite book |last=Ueshiba |first=Kisshōmaru |title=The Art of Aikido: Principles and Essential Techniques |publisher=Kodansha International |year=2004 |page=70 |isbn=4-7700-2945-4}}</ref> Aikido is often translated as "the way of unifying (with) [[Qi|life energy]]"<ref>{{cite book
| last = Saotome
| first = Mitsugi
| title = The Principles of Aikido
| publisher = Shambhala
| year = 1989
| page = 222
| location = Boston, Massachusetts
| isbn = 978-0-87773-409-3
}}</ref> or as "the way of harmonious spirit".<ref name="ADS">{{cite book
| last1 = Westbrook
| first1 = Adele
|last2=Ratti
|first2=Oscar
| title = Aikido and the Dynamic Sphere
| publisher = Charles E. Tuttle Company
| year = 1970
| pages = 16–96
| location = Tokyo, Japan
| isbn = 978-0-8048-0004-4
}}</ref> According to the founder's philosophy, the primary goal in the practice of aikido is to overcome oneself instead of cultivating violence or aggressiveness.<ref name="Jones2015">{{cite book|author=David Jones|title=Martial Arts Training in Japan: A Guide for Westerners|url=https://books.google.com/books?id=J-ANCwAAQBAJ&pg=PA65|year=2015|publisher=Tuttle Publishing|isbn=978-1-4629-1828-7|page=65}}</ref> Morihei Ueshiba used the phrase {{Nihongo3|"true victory, final victory over oneself, here and now"|正勝吾勝勝速日|"masakatsu agatsu katsuhayabi"}} to refer to this principle.<ref name="Gordon2019">{{cite book|author=Michael A. Gordon|title=Aikido as Transformative and Embodied Pedagogy: Teacher as Healer|url=https://books.google.com/books?id=iQSjDwAAQBAJ&pg=PA28|year=2019|publisher=Springer|isbn=978-3-030-23953-4|page=28}}</ref>

[[File:Ueshiba Mitsuteru (Nippon Budokan, 2017).webm|thumb|[[Mitsuteru Ueshiba]] at the 55th All Japan Aikido Demonstration held at the Nippon Budokan (May 2017)]]

Aikido's fundamental principles include: {{transliteration|ja|[[irimi]]}}<ref>{{Cite book|last=Ueshiba|first=Morihei|title=Budo: Teachings Of The Founder Of Aikido|publisher=Kodansha America|year=2013|isbn=978-1-56836-487-2|location=New York|pages=33–35}}</ref> (entering), {{transliteration|ja|[[atemi]]}} (strikes),<ref>{{Cite book|last=Tamura|first=Nobuyoshi|title=Aikido – Etiquette et transmission. Manuel a l'usage des professeurs.|publisher=Editions du Soleil Levant|year=1991|isbn=2-84028-000-0|location=Aix en Provence}}</ref><ref>{{Cite book|last=Abe|first=Tadashi|title=L'aiki-do – Methode unique creee par le maitre Morihei Ueshiba – L'arme et l'esprit du samourai japonais.|publisher=Editions Chiron|year=1958|location=France}}</ref> {{transliteration|ja|kokyu-ho}} (breathing control), {{transliteration|ja|sankaku-ho}} (triangular principle), and {{transliteration|ja|[[tenkan]]}} (turning) movements which redirect the opponent's attack [[momentum]]. Its curriculum comprises various techniques, primarily [[Throw (grappling)|throw]]s and [[joint lock]]s.<ref name="Aikido">{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Aikido
 |encyclopedia=Encyclopedia of Aikido
 |year=2006
|url=http://www.aikidojournal.com/encyclopedia.php?entryID=18
 |archive-url=https://web.archive.org/web/20061206050153/http://www.aikidojournal.com/encyclopedia.php?entryID=18
 |archive-date=6 December 2006
}}</ref> It includes a weapons system encompassing the {{transliteration|ja|[[bokken]]}}, {{transliteration|ja|[[tantō]]}}, and {{transliteration|ja|[[jō]]}}. Aikido derives mainly from the martial art of [[Daitō-ryū Aiki-jūjutsu]], but began to diverge from it in the late 1920s, partly due to Ueshiba's involvement with the [[Ōmoto-kyō]] religion. Ueshiba's early students' documents bear the term {{transliteration|ja|aiki-jūjutsu}}.<ref name="Pranin-Aikijujutsu">{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Aikijujutsu
 |encyclopedia=Encyclopedia of Aikido
 |year=2006
|url=http://www.aikidojournal.com/encyclopedia?entryID=31
 |archive-url=https://web.archive.org/web/20140826192614/http://www.aikidojournal.com/encyclopedia?entryID=31
 |archive-date=26 August 2014
}}</ref>

Ueshiba's senior students have different approaches to aikido, depending partly on when they studied with him. Today, aikido is found all over the world in a number of styles, with broad ranges of interpretation and emphasis. However they all share techniques formulated by Ueshiba and most have concern for the well-being of the attacker.

==Etymology and basic philosophy==
{{Unreferenced section|date=April 2026}}
[[File:合氣道.svg|thumb|80px|"Aikidō" written with "[[Qi|ki]]" in its [[Kyūjitai|old character form]]]]

The word "aikido" is formed of three [[kanji]]:
* {{lang|ja|[[wikt:en:合|合]]}}&nbsp;– {{transliteration|ja|ai}}&nbsp;– harmony, unifying
* {{lang|ja|[[wikt:en:気|気]]}}&nbsp;– {{transliteration|ja|ki}}&nbsp;– energy, spirit
* {{lang|ja|[[wikt:en:道|道]]}}&nbsp;– {{transliteration|ja|dō}}&nbsp;– way, path

The term {{transliteration|ja|[[Aiki (martial arts principle)|aiki]]}} does not readily appear in the Japanese language outside the scope of [[budō]]. This has led to many possible interpretations of the word. {{lang|ja|合}} ({{transliteration|ja|Ai}}) is mainly used in compounds to mean 'combine, unite, join, meet', examples being {{lang|ja|合同}} (combined/united), {{lang|ja|合成}} (composition), {{lang|ja|結合}} (unite/combine/join), {{lang|ja|連合}} (union/alliance/association), {{lang|ja|統合}} (combine/unify), and {{lang|ja|合意}} (mutual agreement). There is an idea of [[Norm of reciprocity|reciprocity]], {{lang|ja|知り合う}} (to get to know one another), {{lang|ja|話し合い}} (talk/discussion/negotiation), and {{lang|ja|待ち合わせる}} (meet by appointment).

{{lang|ja|気}} ({{transliteration|ja|ki}}) is often used to describe a feeling or emotive action, as in {{lang|ja|X気がする}} ('I feel X', as in terms of thinking but with less cognitive reasoning), and {{lang|ja|気持ち}} (feeling/sensation); it is used to mean energy or force, as in {{lang|ja|電気}} (electricity) and {{lang|ja|磁気}} (magnetism); it can also refer to qualities or aspects of people or things, as in {{lang|ja|気質}} (spirit/trait/temperament).

The term {{transliteration|ja|dō}} in Aikido is found in many other Japanese martial arts such as, [[judo]] and [[kendo]], and in various non-martial arts, such as [[Japanese calligraphy]] ({{transliteration|ja|shodō}}), [[ikebana|flower arranging]] ({{transliteration|ja|kadō}}) and [[Japanese tea ceremony|tea ceremony]] ({{transliteration|ja|chadō}} or {{transliteration|ja|sadō}}). Therefore, from a purely literal interpretation, aikido is the "Way of combining forces" or "Way of unifying energy", in which the term {{transliteration|ja|aiki}} refers to the martial arts principle or tactic of blending with an attacker's movements for the purpose of controlling their actions with minimal effort.<ref>{{cite encyclopedia
 |last         = Pranin
 |first        = Stanley
 |title        = Aiki
 |encyclopedia = Encyclopedia of Aikido
 |year         = 2007
 |url          = http://www.aikidojournal.com/encyclopedia?entryID=10
 |access-date   = 21 August 2007
 |archive-url   = https://web.archive.org/web/20070926225755/http://www.aikidojournal.com/encyclopedia?entryID=10
 |archive-date  = 26 September 2007
 |df           = dmy-all
}}</ref> One applies {{transliteration|ja|aiki}} by understanding the rhythm and intent of the attacker to find the optimal position and timing to apply a counter-technique.

==History==
[[File:Morihei Ueshiba 1939.jpg|thumb|upright=0.5|left|alt=A middle-aged, mustachioed man in a kimono|Ueshiba in Tokyo in 1939]]
Aikido was created by {{nihongo|[[Ueshiba Morihei|Morihei Ueshiba]]|植芝 盛平}} (1883–1969), referred to by some aikido practitioners as {{transliteration|ja|Ōsensei}} (''Great Teacher'').<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=O-Sensei
 |encyclopedia=Encyclopedia of Aikido
 |year=2007
|url=http://www.aikidojournal.com/encyclopedia?entryID=533
 |archive-url=https://web.archive.org/web/20140826175452/http://www.aikidojournal.com/encyclopedia?entryID=533
 |archive-date=26 August 2014
}}</ref> The term ''aikido'' was coined in the 20th century.<ref>{{cite book|last=Draeger|first=Donn F.|year=1974|title=Modern Bujutsu & Budo – The Martial Arts and Ways of Japan|location=New York|publisher=Weatherhill|page=137|isbn=0-8348-0351-8}}</ref> Ueshiba envisioned aikido not only as the synthesis of his martial training, but as an expression of his personal philosophy of universal peace and reconciliation. During Ueshiba's lifetime and continuing today, aikido has evolved from the {{transliteration|ja|aiki}} that Ueshiba studied into a variety of expressions by martial artists throughout the world.<ref name="Aikido"/>

===Initial development===
[[File:Takeda Sokaku.jpg|thumb|upright=0.7|Takeda Sōkaku]]
Ueshiba developed aikido primarily during the late 1920s through the 1930s through the synthesis of the older martial arts that he had studied.<ref name="AWH">{{cite book
| last1 = Stevens
| first1 = John
| author-link = John Stevens (scholar)
|last2= Rinjiro
|first2=Shirata
| title = Aikido: The Way of Harmony
| publisher = Shambhala
| year = 1984
| pages = 3–17
| location = Boston, Massachusetts
| isbn = 978-0-394-71426-4
}}</ref> The core martial art from which aikido derives is [[Daitō-ryū Aiki-jūjutsu]], which Ueshiba studied directly with [[Takeda Sōkaku]], the reviver of that art. Additionally, Ueshiba is known to have studied [[Tenjin Shin'yō-ryū]] with Tozawa Tokusaburō in [[Tokyo]] in 1901, [[Yagyū Shingan-ryū|Gotōha Yagyū Shingan-ryū]] under Nakai Masakatsu in [[Sakai, Osaka|Sakai]] from 1903 to 1908, and [[judo]] with {{nihongo|Kiyoichi Takagi|高木 喜代市}} (1894–1972) in [[Tanabe, Wakayama|Tanabe]] in 1911.<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Ueshiba, Morihei
 |encyclopedia=Encyclopedia of Aikido
 |year=2006
|url=http://www.aikidojournal.com/encyclopedia.php?entryID=723
 |archive-url=https://web.archive.org/web/20140330055654/http://www.aikidojournal.com/encyclopedia.php?entryID=723
 |archive-date=30 March 2014
}}</ref>

The art of {{transliteration|ja|Daitō-ryū}} is the primary technical influence on aikido. Along with empty-handed throwing and joint-locking techniques, Ueshiba incorporated training movements with weapons, such as those for the [[spear]] ({{transliteration|ja|[[yari]]}}), short [[Stick fighting|staff]] ({{transliteration|ja|[[jō]]}}), and possibly the {{Nihongo|[[bayonet]]|銃剣|jūken}}. Aikido also derives much of its technical structure from the art of swordsmanship ({{transliteration|ja|[[kenjutsu]]}}).<ref name="ADS"/><ref name="TSoA">{{cite book
| last = Homma
| first = Gaku
| title = The Structure of Aikido: Volume 1: Kenjutsu and Taijutsu Sword and Open-Hand Movement Relationships (Structure of Aikido, Vol 1)
| publisher = Blue Snake Books
| year = 1997
| isbn = 1-883319-55-2
}}</ref> Ueshiba moved to [[Hokkaido]] in 1912, and began studying under Takeda Sokaku in 1915; His official association with Daitō-ryū continued until 1937.<ref name="AWH" /> However, during the latter part of that period, Ueshiba had already begun to distance himself from Takeda and the {{transliteration|ja|Daitō-ryū}}. At that time Ueshiba referred to his martial art as "'''Aiki Budō'''". It is unclear exactly when Ueshiba began using the name "aikido", but it became the official name of the art in 1942 when the Greater Japan Martial Virtue Society ({{transliteration|ja|[[Dai Nippon Butoku Kai]]}}) was engaged in a government sponsored reorganization and centralization of Japanese martial arts.<ref name="Aikido" />

===Religious influences===
[[File:Onisaburo Deguchi 2.jpg|thumb|upright=0.7|Onisaburo Deguchi]]
After Ueshiba left Hokkaido in 1919, he met and was profoundly influenced by [[Onisaburo Deguchi]], the spiritual leader of the [[Ōmoto-kyō]] religion (a neo-[[Shinto]] movement) in [[Ayabe, Kyoto|Ayabe]].<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Morihei Ueshiba and Onisaburo Deguchi
 |encyclopedia=Encyclopedia of Aikido
|url=http://www.aikidojournal.com/article.php?articleID=73
 |archive-url=https://web.archive.org/web/20071017200533/http://www.aikidojournal.com/article.php?articleID=73
 |archive-date=17 October 2007
}}</ref> One of the primary features of Ōmoto-kyō is its emphasis on the attainment of [[utopia]] during one's life. The idea was a great influence on Ueshiba's martial arts philosophy of extending love and compassion especially to those who seek to harm others. Aikido demonstrates this philosophy in its emphasis on mastering martial arts so that one may receive an attack and harmlessly redirect it. In an ideal resolution, not only is the receiver unharmed, but so is the attacker.<ref>{{cite web
| last = Oomoto Foundation
| title = The Teachings
| work = Teachings and Scriptures
| publisher = Netinformational Commission
| year = 2007
| url = http://www.oomoto.or.jp/English/enDokt/dokt-en.html
| access-date = 14 August 2007
| archive-url= https://web.archive.org/web/20070813025607/http://www.oomoto.or.jp/English/enDokt/dokt-en.html
| archive-date= 13 August 2007
| url-status= live}}</ref> In addition to the effect on his spiritual growth, the connection with Deguchi gave Ueshiba entry to elite political and military circles as a martial artist. As a result of the exposure, he was able to attract not only financial backing but also gifted students. Several of the students went on to begin their own styles of aikido.<ref name="Styles">{{cite journal
 |last=Shishida
 |first=Fumiaki
 |title=Aikido
 |journal=Aikido Journal
 |date=January 2002
|url=http://www.aikidojournal.com/article.php?articleID=626
 |isbn=0-9647083-2-9
 |publisher=Shodokan Pub.
 |location=Berkeley, CA
 |archive-url=https://web.archive.org/web/20070926225638/http://www.aikidojournal.com/article.php?articleID=626
 |archive-date=26 September 2007
}}</ref>

===International dissemination===
Aikido was first introduced to the rest of the world in 1951 by [[Minoru Mochizuki]] with a visit to [[France]], where he demonstrated aikido techniques to judo students.<ref name="Mochizuki">{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Mochizuki, Minoru
 |encyclopedia=Encyclopedia of Aikido
 |year=2006
|url=http://www.aikidojournal.com/encyclopedia.php?entryID=474
 |archive-url=https://web.archive.org/web/20140826182832/http://www.aikidojournal.com/encyclopedia.php?entryID=474
 |archive-date=26 August 2014
}}</ref> He was followed by [[Tadashi Abe]] in 1952, who came as the official [[Aikikai]] Hombu representative, remaining in France for seven years. [[Kenji Tomiki]] toured with a delegation of various martial arts through 15 continental states of the United States in 1953.<ref name="Styles"/><ref>{{cite web|url=http://ejmas.com/jnc/jncart_svinth3_0100.htm|title=Journal of Non-lethal Combat: Judo in the US Air Force, 1953|author=Robert W. Smith|work=ejmas.com}}</ref> Later in the same year, [[Koichi Tohei]] was sent by Aikikai Hombu to [[Hawaii]] for a full year, where he set up several [[dōjō]]. The trip was followed by several visits and is considered the formal introduction of aikido to the United States. The United Kingdom followed in 1955; Italy in 1964 by [[Hiroshi Tada]]; and Germany in 1965 by [[Katsuaki Asai]]. Designated the "Official Delegate for Europe and Africa" by Morihei Ueshiba, [[Masamichi Noro]] arrived in France in September 1961. [[Seiichi Sugano]] was appointed to introduce aikido to Australia in 1965. Today there are aikido dōjō throughout the world. [[Steven Seagal]]'s film debut ''[[Above the Law (1988 film)|Above the Law]]'' (1988) is regarded as the first American film to feature aikido in fight sequences.<ref>{{cite web | url=https://www.wingchunnews.ca/the-truth-about-steven-seagals-aikido/ | title=The Truth About Steven Seagal's Aikido | date=June 29, 2022 | access-date=4 March 2024 | archive-date=17 February 2023 | archive-url=https://web.archive.org/web/20230217225235/https://www.wingchunnews.ca/the-truth-about-steven-seagals-aikido/ | url-status=dead }}</ref><ref>{{cite book|author1=Bill Palmer |author2=Karen Palmer |author3=Ric Meyers |title=The Encyclopedia of Martial Arts Movies|date=January 1995 |publisher=[[Scarecrow Press]], 1995|isbn=1-4616-7275-9|page=2}}</ref>

===Proliferation of independent organizations===
{{further|Aikido styles}}
{{see also|List of aikidoka|l1=List of aikidōka}}

The largest aikido organization is the [[Aikikai Foundation]], which remains under the control of the Ueshiba family. However, aikido has developed into many styles, most of which were formed by Morihei Ueshiba's major students.<ref name="Styles"/> The earliest independent styles to emerge were [[Yoseikan Aikido]], begun by [[Minoru Mochizuki]] in 1931,<ref name="Mochizuki" /> [[Yoshinkan]] Aikido, founded by [[Gozo Shioda]] in 1955,<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Yoshinkan Aikido
 |encyclopedia=Encyclopedia of Aikido
 |year=2006
|url=http://www.aikidojournal.com/encyclopedia.php?entryID=785
 |archive-url=https://web.archive.org/web/20070926225749/http://www.aikidojournal.com/encyclopedia.php?entryID=785
 |archive-date=26 September 2007
}}</ref> and [[Shodokan Aikido]], founded by [[Kenji Tomiki]] in 1967.<ref name="ACE">{{cite book
| last1 = Shishido
| first1 = Fumiaki
| author-link = Fumiaki Shishida
|last2=Nariyama
|first2=Tetsuro
|author-link2= Tetsuro Nariyama
| title = Aikido: Tradition and the Competitive Edge
| publisher = Shodokan Publishing
| year = 2002
| isbn = 978-0-9647083-2-7
}}</ref> The emergence of these styles pre-dated Ueshiba's death and did not cause any major upheavals when they were formalized. Shodokan Aikido, however, was controversial, since it introduced a unique rule-based competition that some felt was contrary to the spirit of aikido.<ref name="Styles" />

After Ueshiba's death in 1969, two more major styles emerged. Significant controversy arose with the departure of the [[Aikikai Hombu Dojo]]'s chief instructor [[Koichi Tohei]], in 1974. Tohei left as a result of a disagreement with the son of the founder, [[Kisshomaru Ueshiba]], who at that time headed the Aikikai Foundation. The disagreement was over the proper role of {{transliteration|ja|ki}} development in regular aikido training. After Tohei left, he formed his own style, called [[Shin Shin Toitsu Aikido]], and the organization that governs it, the Ki Society ({{transliteration|ja|Ki no Kenkyūkai}}).<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Tohei, Koichi
 |encyclopedia=Encyclopedia of Aikido
 |year=2006
|url=http://www.aikidojournal.com/encyclopedia.php?entryID=701
 |archive-url=https://web.archive.org/web/20070807104204/http://www.aikidojournal.com/encyclopedia.php?entryID=701
 |archive-date=7 August 2007
}}</ref> A final major style evolved from Ueshiba's retirement in [[Iwama, Ibaraki]] and the teaching methodology of long term student [[Morihiro Saito]]. It is unofficially referred to as the "[[Iwama style]]", and at one point a number of its followers formed a loose network of schools they called [[Iwama Ryu]]. Although Iwama style practitioners remained part of the Aikikai until Saito's death in 2002, followers of Saito subsequently split into two groups. One remained with the Aikikai and the other formed the independent [[Shinshin Aikishuren Kai]] in 2004 around Saito's son [[Hitohiro Saito]].

Today, the major styles of aikido are each run by a separate governing organization, have their own {{Nihongo|headquarters|本部道場|honbu dōjō}} in Japan, and are taught throughout the world.<ref name="Styles"/>

=={{transliteration|ja|Ki}}==
{{Original research|section|date=April 2026}}
[[File:ki obsolete.svg|right|thumb|100px|The [[kanji]] for {{transliteration|ja|ki}} until 1946 is shown; in 1946 [[Tōyō kanji|it was changed]] to {{lang|ja|[[wikt:気|気]]}}.]]

The study of {{transliteration|ja|[[Qi|ki]]}} is an important component of aikido. The term does not specifically refer to either physical or mental training, as it encompasses both. The [[kanji]] for {{transliteration|ja|ki}} was written in its older form as {{lang|ja|氣}} up until the Japanese governmental [[Tōyō kanji|writing reforms after World War II]], and now is more prevalently seen in its modern form of {{lang|ja|気}}. This form has the removal of the eight directions denoting the pre and post natal energies of {{nihongo||元氣|genki}} (Chinese – {{transliteration|zh|[[Yuanqi|yuán qì]]}}) also known in the Art of Aikido as "Source energy".

The character for {{transliteration|ja|ki}} is used in everyday Japanese terms, such as {{Nihongo|"health"|元気|genki}}, or {{Nihongo|"shyness"|内気|uchiki}}. {{transliteration|ja|Ki}} has many meanings, including "ambience", "mind", "mood", or "intention and action", although its literal meaning is 'air' or 'breath'. However, in traditional martial arts and medicine it is often referred to in its more general terminology as "life energy". [[Gozo Shioda]]'s [[Yoshinkan]] Aikido, considered one of the "hard styles", largely follows Ueshiba's teachings from before World War II, and surmises that the secret to {{transliteration|ja|ki}} lies in timing and the application of the whole body's strength to a single point.<ref name="Shugyo"/> In later years, Ueshiba's application of {{transliteration|ja|ki}} in aikido took on a softer, more gentle feel. The concept was known as [[Takemusu]] Aiki, and many of his later students teach about {{transliteration|ja|ki}} from this perspective. [[Koichi Tohei]]'s [[Ki Society]] centers almost exclusively around the study of the [[empirical]] (albeit subjective) experience of {{transliteration|ja|ki}}, with students' proficiency in aikido techniques and {{transliteration|ja|ki}} development ranked separately.<ref>{{cite web |last=Reed |first=William |title=A Test Worth More than a Thousand Words |year=1997 |url=http://www.b-smart.net/archive/test_article_0497.html |access-date=11 August 2007 |archive-url=https://web.archive.org/web/20070619083726/http://www.b-smart.net/archive/test_article_0497.html |archive-date=19 June 2007 }}</ref>

==Training==
{{Original research|section|date=April 2026}}
[[File:Aïkido-shihoo nage.jpg|thumb|right|200px|Training ([[:ja:稽古|稽古]] Keiko). {{transliteration|ja|[[Uke (martial arts)|Ukemi]]}} ({{lang|ja|受け身}}) is very important for safe practice.]]
In aikido, as in virtually all Japanese [[martial arts]], there are both physical and mental aspects of training. The physical training in aikido is diverse, covering both general physical fitness and [[Exercise|conditioning]], as well as specific techniques.<ref name="AFL">{{cite book
| last = Homma
| first = Gaku
| title = Aikido for Life
| publisher = North Atlantic Books
| year = 1990
| page = [https://archive.org/details/aikidoforlife0000homm/page/20 20]
| location = Berkeley, California
| isbn = 978-1-55643-078-7
| url = https://archive.org/details/aikidoforlife0000homm/page/20
}}</ref> Because a substantial portion of any aikido curriculum consists of [[throw (grappling)|throws]], beginners learn how to safely fall or roll.<ref name="AFL"/> The specific techniques for attack include both strikes and grabs; the techniques for defense consist of throws and [[Pinning hold|pins]]. After basic techniques are learned, students study freestyle defense against multiple opponents, and techniques with weapons.

In some dojo, [[Uchi-deshi]] programs permit students to live in the dojo and immerse themselves in practice several times each day. 
===Fitness===
Physical training goals pursued in conjunction with aikido include controlled [[relaxation technique|relaxation]], correct movement of joints such as hips and shoulders, [[flexibility (anatomy)|flexibility]], and [[endurance]], with less emphasis on [[strength training]]. In aikido, pushing or extending movements are much more common than pulling or contracting movements. This distinction can be applied to general fitness goals for the aikido practitioner.<ref name="ADS"/> In aikido, specific muscles or muscle groups are not isolated and worked to improve tone, mass, or power. Aikido-related training emphasizes the use of coordinated whole-body movement and balance similar to [[yoga as exercise|yoga]] or [[pilates]]. For example, many dōjōs begin each class with {{Nihongo|warm-up exercises|準備体操|junbi taisō}}, which may include [[stretching]] and {{transliteration|ja|[[Uke (martial arts)|ukemi]]}} (break falls).<ref>{{cite encyclopedia |last=Pranin |first=Stanley |title=Jumbi Taiso |encyclopedia=Encyclopedia of Aikido |year=2006 |url=http://www.aikidojournal.com/encyclopedia.php?entryID=340 |archive-url=https://web.archive.org/web/20071016190245/http://www.aikidojournal.com/encyclopedia.php?entryID=340 |archive-date=16 October 2007 }}</ref>

===Roles of {{transliteration|ja|uke}} and {{transliteration|ja|tori}}===
[[File:G Blaize Kokiu Nague 2.JPG|thumb|"Shite" (Nage), in this case, is the person on the right. He is doing Kokyu-Nage (呼吸投げ).<br /> "Uke", in this case on the left, is doing rolling [[Ukemi]] (France, 2002).]]
Aikido training is based primarily on two partners practicing pre-arranged forms ({{transliteration|ja|[[kata]]}}) rather than freestyle practice. The basic pattern is for the receiver of the technique ({{transliteration|ja|[[uke (martial arts)|uke]]}}) to initiate an attack against the person who applies the technique—the {{nihongo||取り|[[Tori (martial arts)|tori]]}}, or {{nihongo||仕手|shite}} (depending on aikido style), also referred to as {{nihongo||投げ|nage}} (when applying a throwing technique), who neutralises this attack with an aikido technique.<ref name="afl2"/>

Both halves of the technique, that of {{transliteration|ja|uke}} and that of {{transliteration|ja|tori}}, are considered essential to aikido training.<ref name="afl2"/> Both are studying aikido principles of blending and adaptation. {{transliteration|ja|Tori}} learns to blend with and control attacking energy, while {{transliteration|ja|uke}} learns to become calm and flexible in the disadvantageous, off-balance positions in which {{transliteration|ja|tori}} places them. This "receiving" of the technique is called {{transliteration|ja|ukemi}}.<ref name="afl2">{{cite book
| last = Homma
| first = Gaku
| title = Aikido for Life
| publisher = North Atlantic Books
| year = 1990 | pages = 20–30
| location = Berkeley, California
| isbn = 978-1-55643-078-7
| url = https://books.google.com/books?id=cmvuAkvibXkC
}}</ref> {{transliteration|ja|Uke}} continuously seeks to regain balance and cover vulnerabilities (e.g., an exposed side), while {{transliteration|ja|tori}} uses position and timing to keep {{transliteration|ja|uke}} off-balance and vulnerable. In more advanced training, {{transliteration|ja|uke}} will sometimes apply {{Nihongo|reversal techniques|返し技|kaeshi-waza}} to regain balance and pin or throw {{transliteration|ja|tori}}. {{Nihongo||受身|Ukemi}} refers to the act of receiving a technique. Good {{transliteration|ja|ukemi}} involves attention to the technique, the partner, and the immediate environment—it is considered an active part of the process of learning aikido. The method of falling itself is also important, and is a way for the practitioner to receive an aikido technique safely and minimize risk of injury.

===Initial attacks===
Aikido techniques are usually a defense against an attack, so students must learn to deliver various types of attacks to be able to practice aikido with a partner. Although attacks are not studied as thoroughly as in striking-based arts, attacks with intent (such as a strong strike or an immobilizing grab) are needed to study correct and effective application of technique.<ref name="ADS"/> Many of the {{Nihongo|strikes|打ち|uchi}} of aikido resemble cuts from a [[sword]] or other grasped object, which indicate its origins in techniques intended for [[weapon|armed]] combat.<ref name="ADS" /> Other techniques which explicitly appear to be punches ({{transliteration|ja|[[tsuki]]}}), are practiced as thrusts with a [[knife]] or sword. [[Kick]]s are generally reserved for upper-level variations; reasons cited include that falls from kicks are especially dangerous, and that kicks (high kicks in particular) were uncommon during the types of combat prevalent in feudal Japan.

Some basic strikes include:
* {{Nihongo|'''Front-of-the-head strike'''|正面打ち|shōmen'uchi}} is a vertical [[knifehand strike]] to the head. In training, this is usually directed at the forehead or the [[Crown (anatomy)|crown]] for safety, but more dangerous versions of this attack target the bridge of the nose and the [[maxillary sinus]].
* {{Nihongo|'''Side-of-the-head strike'''|横面打ち|yokomen'uchi}} is a diagonal knifehand strike to the side of the head or neck.
* {{Nihongo|'''Chest thrust'''|胸突き|mune-tsuki}} is a [[Punch (strike)|punch]] to the [[torso]]. Specific targets include the [[chest]], [[abdomen]], and [[solar plexus]], sometimes referred to as {{Nihongo|"middle-level thrust"|中段突き|chūdan-tsuki}}, or {{Nihongo|"direct thrust"|直突き|[[choku-tsuki]]}}.
* {{Nihongo|'''Face thrust'''|顔面突き|ganmen-tsuki}} is a punch to the [[face]], sometimes referred to as {{Nihongo|"upper-level thrust"|上段突き|jōdan-tsuki}}.

Beginners in particular often practice techniques from grabs, both because they are safer and because it is easier to feel the energy and the direction of the movement of force of a hold than it is for a strike. Some grabs are historically derived from being held while trying to draw a [[Katana|weapon]], whereupon a technique could then be used to free oneself and immobilize or strike the attacker while they are grabbing the defender.<ref name="ADS"/> Here are examples of some basic grabs:
* {{Nihongo|'''Single-hand grab'''|片手取り|katate-dori}}, when one hand grabs one wrist.
* {{Nihongo|'''Both-hands grab'''|諸手取り|morote-dori}}, when both hands grab one wrist; sometimes referred to as {{Nihongo|"single hand double-handed grab"|片手両手取り|katateryōte-dori}}
* {{Nihongo|'''Both-hands grab'''|両手取り|ryōte-dori}}, when both hands grab both wrists; sometimes referred to as {{Nihongo|"double single-handed grab"|両片手取り|ryōkatate-dori}}.
* {{Nihongo|'''Shoulder grab'''|肩取り|kata-dori}} when one shoulder is grabbed.
* {{Nihongo|'''Both-shoulders-grab'''|両肩取り|ryōkata-dori}}, when both shoulders are grabbed. It is sometimes combined with an overhead strike as {{Nihongo|'''shoulder grab face strike'''|肩取り面打ち|kata-dori men-uchi}}.
* {{Nihongo|'''Chest grab'''|胸取り|mune-dori or muna-dori}}, when the lapel is grabbed; sometimes referred to as {{Nihongo|"collar grab"|襟取り|eri-dori}}.

===Basic techniques===
{{main|Aikido techniques}}
[[File:Aikido ikkyo.svg|right|thumb|Diagram of {{transliteration|ja|ikkyō}}, or "first technique"]]
Here is a sample of the basic or widely practiced throws and pins. Many of the techniques derive from Daitō-ryū Aiki-jūjutsu, but some others were invented by Morihei Ueshiba. The precise terminology for some may vary between organisations and styles; the terms presented are the terms used by the Aikikai Foundation. Although the names of the first five techniques listed are in succession, they are not universally taught in numeric order.<ref>{{cite book
| last = Shifflett
| first = C.M.
| title = Aikido Exercises for Teaching and Training
| publisher = North Atlantic Books
| year = 1999
| location = Berkeley, California
| isbn = 978-1-55643-314-6
}}</ref>
* {{Nihongo|'''First technique'''|一教 ([[wikt:教|教]])|ikkyō}}, a control technique using one hand on the elbow and one hand near the wrist which leverages {{transliteration|ja|uke}} to the ground.<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Ikkyo
 |encyclopedia=Encyclopedia of Aikido
 |year=2008
|url=http://www.aikidojournal.com/encyclopedia?entryID=289
 |archive-url=https://web.archive.org/web/20140826181246/http://www.aikidojournal.com/encyclopedia?entryID=289
 |archive-date=26 August 2014
}}</ref> This grip applies pressure into the [[ulnar nerve]] at the wrist.
* {{Nihongo|'''Second technique'''|二教|nikyō}} is a [[Kote mawashi|pronating wristlock]] that torques the arm and applies painful nerve pressure. (There is an [[Wristlock#Adductive wristlock|adductive wristlock]] or Z-lock in the {{transliteration|ja|ura}} version.)
* {{Nihongo|'''Third technique'''|三教|sankyō}} is a [[Wristlock#Rotational wristlock|rotational wristlock]] that directs upward-spiraling tension throughout the arm, elbow and shoulder.
* {{Nihongo|'''Fourth technique'''|四教|yonkyō}} is a shoulder control technique similar to {{transliteration|ja|ikkyō}}, but with both hands gripping the forearm. The knuckles (from the palm side) are applied to the recipient's [[radial nerve]] against the [[periosteum]] of the forearm bone.<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Yonkyo
 |encyclopedia=Encyclopedia of Aikido
 |year=2008
|url=http://www.aikidojournal.com/encyclopedia?entryID=780
 |archive-url=https://web.archive.org/web/20080122182812/http://www.aikidojournal.com/encyclopedia?entryID=780
 |archive-date=22 January 2008
}}</ref>
* {{Nihongo|'''Fifth technique'''|五教|gokyō}} is a technique that is visually similar to {{transliteration|ja|ikkyō}}, but with an inverted grip of the wrist, [[medial rotation]] of the arm and shoulder, and downward pressure on the elbow. Common in [[knife]] and other weapon take-aways.
* '''{{Nihongo|'''Four-direction throw'''|四方投げ|shihōnage}}''' is a throw during which {{transliteration|ja|uke}}'s hand is folded back past the shoulder, locking the shoulder joint.
* {{Nihongo|'''Forearm return'''|小手返し|kotegaeshi}} is a [[Kote gaeshi|supinating]] wristlock-throw that stretches the [[extensor digitorum]].
* {{Nihongo|'''Breath throw'''|呼吸投げ|kokyūnage}} is a loosely used umbrella term for various types of mechanically unrelated techniques; {{transliteration|ja|kokyūnage}} generally do not use joint locks like other techniques.<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Kokyunage
 |encyclopedia=Encyclopedia of Aikido
 |year=2008
|url=http://www.aikidojournal.com/encyclopedia?entryID=419
 |archive-url=https://web.archive.org/web/20080122182746/http://www.aikidojournal.com/encyclopedia?entryID=419
 |archive-date=22 January 2008
}}</ref>
* {{Nihongo|'''Entering throw'''|入身投げ|iriminage}}, throws in which {{transliteration|ja|tori}} moves through the space occupied by {{transliteration|ja|uke}}. The classic form superficially resembles a "clothesline" technique.
* {{Nihongo|'''Heaven-and-earth throw'''|天地投げ|tenchinage}}, a throw in which, beginning with {{transliteration|ja|ryōte-dori}}, moving forward, {{transliteration|ja|tori}} sweeps one hand low ("earth") and the other high ("heaven"), which unbalances {{transliteration|ja|uke}} so that they easily topple over.
* {{Nihongo|'''Hip throw'''|腰投げ|koshinage}}, aikido's version of the [[throw (grappling)#Hip throws|hip throw]]; {{transliteration|ja|tori}} drops their hips lower than those of {{transliteration|ja|uke}}, then flips {{transliteration|ja|uke}} over the resultant [[Lever|fulcrum]].
* {{Nihongo|'''Figure-ten throw'''|十字投げ|jūjinage}}, a throw that locks the arms against each other (the [[kanji]] for "10" is a cross-shape: {{lang|ja|十}}).<ref>{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Juji Garami
 |encyclopedia=Encyclopedia of Aikido
 |year=2008
|url=http://www.aikidojournal.com/encyclopedia?entryID=337
 |archive-url=https://web.archive.org/web/20080122182726/http://www.aikidojournal.com/encyclopedia?entryID=337
 |archive-date=22 January 2008
}}</ref>
* {{Nihongo|'''Rotary throw'''|回転投げ|kaitennage}} is a throw in which {{transliteration|ja|tori}} sweeps {{transliteration|ja|uke}}'s arm back until it locks the shoulder joint, then uses forward pressure to throw them.<ref>{{cite encyclopedia |last=Pranin |first=Stanley |title=Kaitennage |encyclopedia=Encyclopedia of Aikido |year=2008 |url=http://www.aikidojournal.com/encyclopedia?entryID=342 |archive-url=https://web.archive.org/web/20080122182741/http://www.aikidojournal.com/encyclopedia?entryID=342 |archive-date=22 January 2008 }}</ref>

===Implementations===
[[File:Aikido ikkyo omote ura.png|left|thumb|Diagram showing two versions of the {{transliteration|ja|ikkyō}} technique: one moving forward (the {{transliteration|ja|omote}} version) and one moving backward (the {{transliteration|ja|ura}} version)]]

Aikido makes use of body movement ({{transliteration|ja|tai sabaki}} or {{lang|ja|体捌き}}) to blend the movement of {{transliteration|ja|tori}} with the movement of {{transliteration|ja|uke}}. For example, an "entering" ({{transliteration|ja|[[irimi]]}}) technique consists of movements inward towards {{transliteration|ja|uke}}, while a {{Nihongo|"turning"|転換|tenkan}} technique uses a pivoting motion.<ref>{{cite journal
 |last=Amdur
 |first=Ellis
 |title=Irimi
 |journal=Aikido Journal
|url=http://www.aikidojournal.com/article.php?articleID=686
 |archive-url=https://web.archive.org/web/20071017193616/http://www.aikidojournal.com/article.php?articleID=686
 |archive-date=17 October 2007
}}</ref>
Additionally, an {{Nihongo|"inside"|内|uchi}} technique takes place in front of {{transliteration|ja|uke}}, whereas an {{Nihongo|"outside"|外|soto}} technique takes place to their side; a {{Nihongo|"front"|表|omote}} technique is applied with motion to the front of {{transliteration|ja|uke}}, and a {{Nihongo|"rear"|裏|ura}} version is applied with motion towards the rear of {{transliteration|ja|uke}}, usually by incorporating a turning or pivoting motion. Finally, most techniques can be performed while in a seated posture ({{transliteration|ja|[[seiza]]}}). Techniques where both {{Lang|ja|uke}} and {{transliteration|ja|tori}} are standing are called {{transliteration|ja|tachi-waza}}, techniques where both start off in {{transliteration|ja|seiza}} are called {{transliteration|ja|suwari-waza}}, and techniques performed with {{transliteration|ja|uke}} standing and {{transliteration|ja|tori}} sitting are called {{transliteration|ja|hanmi handachi}} ({{lang|ja|半身半立}}).<ref name="dynamic"/> From these few basic techniques, there are numerous of possible implementations. For example, {{transliteration|ja|ikkyō}} can be applied to an opponent moving forward with a strike (perhaps with an {{transliteration|ja|ura}} type of movement to redirect the incoming force), or to an opponent who has already struck and is now moving back to reestablish distance (perhaps an {{transliteration|ja|omote-waza}} version). Specific aikido {{transliteration|ja|kata}} are typically referred to with the formula "attack-technique(-modifier)"; {{transliteration|ja|katate-dori ikkyō}}, for example, refers to any {{transliteration|ja|ikkyō}} technique executed when {{transliteration|ja|uke}} is holding one wrist. This could be further specified as {{transliteration|ja|katate-dori ikkyō omote}} (referring to any forward-moving {{transliteration|ja|ikkyō}} technique from that grab).

{{nihongo||当て身|[[Atemi]]}} are strikes (or [[feint]]s) employed during an aikido technique. Some view {{transliteration|ja|atemi}} as attacks against "[[pressure point|vital points]]" meant to cause damage in and of themselves. For instance, [[Gozo Shioda]] described using {{transliteration|ja|atemi}} in a brawl to quickly down a gang's leader.<ref name="Shugyo">{{cite book
| first = Gōzō
| last = Shioda
| author-link = Gozo Shioda
|others= Translated by Payet, Jacques
|author2= Johnston, Christopher
| title = Aikido Shugyo: Harmony in Confrontation
| publisher = Shindokan Books
| year = 2000
| isbn = 978-0-9687791-2-5
}}</ref> Others consider {{transliteration|ja|atemi}}, especially to the face, to be methods of distraction meant to enable other techniques; a strike, even if it is blocked, can startle the target and break their concentration. Additionally, the target may also become unbalanced while attempting to avoid a strike (by jerking the head back, for example) which may allow for an easier throw.<ref name="dynamic">{{cite book
| last = Shioda
| first = Gōzō
| author-link = Gozo Shioda
| title = Dynamic Aikido
| publisher = Kodansha International
| pages = [https://archive.org/details/dynamicaikido00shio_0/page/52 52–55]
| year = 1968
| isbn = 978-0-87011-301-7
| url = https://archive.org/details/dynamicaikido00shio_0/page/52
}}</ref> Many sayings about {{transliteration|ja|atemi}} are attributed to Morihei Ueshiba, who considered them an essential element of technique.<ref>{{cite web
 |last        = Scott
 |first       = Nathan
 |title       = Teachings of Ueshiba Morihei Sensei
 |year        = 2000
 |url         = http://www.tsuki-kage.com/ueshiba.html
 |access-date  = 1 February 2007
 |archive-url  = https://web.archive.org/web/20061231203238/http://www.tsuki-kage.com/ueshiba.html
 |archive-date = 31 December 2006
 }}</ref>

===Weapons===
[[Image:PRehse002-cropped.jpg|right|thumb|Disarming an attacker using a {{Nihongo|"sword taking"|太刀取り|tachi-dori}} technique]]

Weapons training in aikido traditionally includes the short staff ({{transliteration|ja|[[jō]]}}) (these techniques closely resemble the use of the bayonet, or [[Jūkendō]]), the wooden sword ({{transliteration|ja|[[bokken]]}}), and the knife ({{transliteration|ja|[[tantō]]}}).<ref>{{cite book| last = Dang
| first = Phong
| title = Aikido Weapons Techniques: The Wooden Sword, Stick, and Knife of Aikido
| publisher = Charles E Tuttle Company
| year = 2006
| isbn = 978-0-8048-3641-8
}}</ref> Some schools incorporate firearm-disarming techniques, where either weapon-taking and/or weapon-retention may be taught. Some schools, such as the [[Iwama style]] of [[Morihiro Saito]], usually spend substantial time practicing with both {{transliteration|ja|bokken}} and {{transliteration|ja|jō}}, under the names of {{transliteration|ja|[[aiki-ken]]}}, and {{transliteration|ja|[[aiki-jō]]}}, respectively. The founder developed many of the empty-handed techniques from traditional sword, spear and bayonet movements. Consequently, the practice of the weapons arts gives insight into the origin of techniques and movements, and reinforces the concepts of distance, timing, foot movement, presence and connectedness with one's training partner(s).<ref name="SOS">{{cite book
| last1 = Ratti
| first1 = Oscar
| last2 = Westbrook
| first2 = Adele
| title = Secrets of the Samurai: The Martial Arts of Feudal Japan
| publisher = Castle Books
| year = 1973
| pages = [https://archive.org/details/secretsofsamurai00osca_0/page/23 23, 356–359]
| location = Edison, New Jersey
| isbn = 978-0-7858-1073-5
| url = https://archive.org/details/secretsofsamurai00osca_0/page/23
}}</ref>

===Multiple attackers and {{transliteration|ja|randori}}===
One feature of aikido is training to defend against multiple attackers, often called {{transliteration|ja|taninzudori}}, or {{transliteration|ja|taninzugake}}. Freestyle practice with multiple attackers called {{nihongo||乱取|[[randori]]}} is a key part of most curricula and is required for the higher-level ranks.<ref name="best">{{cite book
| last1 = Ueshiba
| first1 = Kisshomaru
|first2= Moriteru
|last2=Ueshiba
| title = Best Aikido: The Fundamentals (Illustrated Japanese Classics)
| publisher = Kodansha International
| year = 2002
| isbn = 978-4-7700-2762-7
}}</ref> {{transliteration|ja|Randori}} exercises a person's ability to intuitively perform techniques in an unstructured environment.<ref name="best"/> Strategic choice of techniques, based on how they reposition the student relative to other attackers, is important in {{transliteration|ja|randori}} training. For instance, an {{transliteration|ja|ura}} technique might be used to neutralise the current attacker while turning to face attackers approaching from behind.<ref name="ADS"/>

In [[Shodokan Aikido]], {{transliteration|ja|randori}} differs in that it is not performed with multiple persons with defined roles of defender and attacker, but between two people, where both participants attack, defend, and counter at will. In this respect it resembles judo {{transliteration|ja|randori}}.<ref name="ACE"/><ref>{{cite book|title=Aikido Randori: Tetsuro Nariyama |isbn=978-0-9566205-0-7|via=amazon.co.uk|last1=Nariyama|first1=Tetsurō|year=2010|publisher=Shodokan }}</ref>

===Injuries===
In applying a technique during training, it is the responsibility of {{transliteration|ja|tori}} to prevent injury to {{transliteration|ja|uke}} by employing a speed and force of application that is appropriate with their partner's proficiency in {{transliteration|ja|ukemi}}.<ref name="afl2"/> When injuries (especially to the joints) occur, they are often the result of a {{transliteration|ja|tori}} misjudging the ability of {{transliteration|ja|uke}} to receive the throw or pin.<ref name="Aikinjuries">Aikido and injuries: special report by [[Fumiaki Shishida]] Aiki News 1989;80 (April); partial English translation of article re-printed in Aikido Journal {{cite web|url=http://www.aikidojournal.com/article.php?articleID=8|title=Aikido and Injuries: Special Report|archive-url=https://web.archive.org/web/20071012133627/http://www.aikidojournal.com/article.php?articleID=8|archive-date=12 October 2007|access-date=1 September 2007}}</ref><ref name="Aikinjuries2">{{cite encyclopedia
 |last=Pranin
 |first=Stanley
 |title=Aikido and Injuries
 |encyclopedia=Encyclopedia of Aikido
 |year=1983
|url=http://www.aikidojournal.com/article?articleID=7&highlight=injuries
 |archive-url=https://web.archive.org/web/20080122182653/http://www.aikidojournal.com/article?articleID=7&highlight=injuries
 |archive-date=22 January 2008
}}</ref> A study of injuries in the martial arts showed that the type of injuries varied considerably from one art to the other.<ref name="injurycomparison">{{cite journal
| last1 =Zetaruk
| first1 =M
| last2 =Violán
| first2 =MA
| last3 =Zurakowski
| first3 =D
| last4 =Micheli
| first4 =LJ
| title =Injuries in martial arts: a comparison of five styles
| journal =British Journal of Sports Medicine
| volume =39 | issue =1
| pages =29–33
| publisher =BMJ Publishing Group
| year =2005
| url= | doi =10.1136/bjsm.2003.010322
| pmid =15618336
| pmc =1725005}}</ref> Soft tissue injuries are one of the most common types of injuries found within aikido,<ref name="injurycomparison" /> as well as joint strain and stubbed fingers and toes.<ref name="Aikinjuries2" /> Several deaths from head-and-neck injuries, caused by aggressive {{transliteration|ja|shihōnage}} in a {{transliteration|ja|[[Senpai and kōhai|senpai/kōhai]]}} hazing context, have been reported.<ref name="Aikinjuries" />

===Mental training===
Aikido training is mental as well as physical, emphasizing the ability to relax the mind and body even under the stress of dangerous situations.<ref name="ZENMA">{{cite book
| last = Hyams
| first = Joe
| title = Zen in the Martial Arts
| publisher = Bantam Books
| year = 1979
| pages = 53–57
| location = New York
| isbn = 0-553-27559-3
}}</ref> This is necessary to enable the practitioner to perform the 'enter-and-blend' movements that underlie aikido techniques, wherein an attack is met with confidence and directness.<ref name="AFL 1-9">{{cite book
| last = Homma
| first = Gaku
| title = Aikido for Life
| publisher = North Atlantic Books
| year = 1990
| pages = [https://archive.org/details/aikidoforlife0000homm/page/1 1–9]
| location = Berkeley, California
| isbn = 978-1-55643-078-7
| url = https://archive.org/details/aikidoforlife0000homm/page/1
}}</ref> Morihei Ueshiba once remarked that one "must be willing to receive 99% of an opponent's attack and stare death in the face" in order to execute techniques without hesitation.<ref name="AOP">{{cite book
|first= Morihei
|last= Ueshiba
|others= Translation by [[John Stevens (scholar)|Stevens, John]]
| title = The Art of Peace| publisher = Shambhala Publications, Inc.
| year = 1992| location = Boston, Massachusetts| isbn = 978-0-87773-851-0}}</ref> As a martial art concerned not only with fighting proficiency but with the betterment of daily life, this mental aspect is of key importance to aikido practitioners.<ref name="NewWarrior">{{cite book| last = Heckler| first = Richard| author-link = Richard Strozzi-Heckler| title = Aikido and the New Warrior| publisher = North Atlantic Books| year = 1985| pages = [https://archive.org/details/aikidonewwarrior00stro/page/51 51–57]| location = Berkeley, California| isbn = 978-0-938190-51-6| url = https://archive.org/details/aikidonewwarrior00stro/page/51}}</ref>

==Uniforms and ranking==
{{stack|[[File:Folding hakama.jpg|thumb|230px|[[Hakama]] are folded after practice to preserve the pleats.]]}}
{| class="wikitable" style="float:right; margin-right:10px"
|-
! rank !! belt !! color !! type
|-
| {{transliteration|ja|kyū}}|| [[File:Judo white belt.svg|65px]] || white || {{transliteration|ja|mudansha}}/{{transliteration|ja|yūkyūsha}}
|-
| {{transliteration|ja|dan}}|| [[File:Judo black belt.svg|65px]] || black || {{transliteration|ja|yūdansha}}
|}
Aikido practitioners (commonly called {{transliteration|ja|aikidōka}} outside Japan) generally progress by promotion through a series of "grades" ({{transliteration|ja|[[kyū]]}}), followed by a series of "degrees" ({{transliteration|ja|[[dan (rank)|dan]]}}), pursuant to formal testing procedures. Some aikido organizations use belts to distinguish practitioners' grades, often simply white and [[Black belt (martial arts)|black belts]] to distinguish {{transliteration|ja|kyu}} and {{transliteration|ja|dan}} grades, although some use various belt colors. Testing requirements vary, so a particular rank in one organization is not comparable or interchangeable with the rank of another.<ref name="ADS"/> Some dōjōs have an age requirement before students can take the {{transliteration|ja|dan}} rank exam.<ref>{{Cite web |last=Federação Portuguesa de Aikido |date=1 April 2007 |title=Rules for Dan Ranks |url=https://www.fpaikido.pt/sites/default/files/docs/Aikikai%20-%201.Rules%20for%20Dan%20Ranks130313.pdf |access-date=24 June 2024}}</ref>

The uniform worn for practicing aikido ({{transliteration|ja|[[aikidogi|aikidōgi]]}}) is similar to the training uniform ({{transliteration|ja|[[keikogi]]}}) used in most other modern martial arts; simple trousers and a wraparound jacket, usually white. Both thick ("[[judo]]-style"), and thin ("[[karate]]-style") cotton tops are used.<ref name="ADS"/> Aikido-specific tops are available with shorter sleeves which reach to just below the elbow.<ref name="seido">{{cite web |title=How to Choose your Aikidogi – Size & Model |url=https://www.seidoshop.com/blogs/the-seido-blog/10-comparative-how-to-choose-your-aikidogi-kimono |website=Seido Shop Blog |date=9 December 2016 |publisher=Seido Shop |access-date=2 August 2022}}</ref>

Most aikido systems add a pair of wide pleated black or [[indigo]] trousers known as {{transliteration|ja|[[hakama]]}} (used also in [[Naginatajutsu]], [[kendo]], and [[iaido]]). In many schools, the wearing of {{transliteration|ja|hakama}} is reserved for practitioners with {{transliteration|ja|dan}} ranks or for instructors, while others allow all practitioners to wear a {{transliteration|ja|hakama}} regardless of rank.<ref name="ADS"/>

==Aikido styles==
[[Aikido styles]] vary in their intention, due to its holistic nature. The most common differences noted in aikido, when observed externally, relate to the intensity and realism of training. [[Stanley Pranin]] has observed that some criticism may stem from weak attacks from {{transliteration|ja|uke}}, allowing for a conditioned response from {{transliteration|ja|tori}}, resulting in underdevelopment of the skills needed for the safe and effective practice of both partners.<ref name="Pranin-aikido today">{{cite journal| last = Pranin| first = Stanley| title = Aikido Practice Today| journal = Aiki News| volume = 86| date = Fall 1990| url = http://www.aikidojournal.com/article?articleID=123| access-date = 2007-11-02| archive-url = https://web.archive.org/web/20071121231252/http://www.aikidojournal.com/article?articleID=123| archive-date = 2007-11-21}}</ref>

To counteract that, some styles allow students to become less compliant over time. However, in keeping with the core philosophies, such allowance is granted only after having demonstrated proficiency in being able to protect themselves and their training partners. [[Shodokan Aikido]] addresses the issue by practicing in a competitive format.<ref name="ACE"/> Such adaptations are debated between styles, with some maintaining that there is no need to adjust their methods because either the criticisms are unjustified, or that they are not training for self-defense or combat effectiveness, but spiritual, fitness or other reasons.<ref>{{cite web|url=http://www.aikidojournal.com/?id=3104|title=In response to the articles by Stanley Pranin&nbsp;– Martial arts in a state of decline? An end to the collusion?|last=Wagstaffe|first=Tony|date=30 March 2007|work=Aikido Journal|archive-url=https://web.archive.org/web/20100522164703/http://www.aikidojournal.com/?id=3104|archive-date=2010-05-22|access-date=2008-07-29}}</ref> Reasons for the difference and diversity of teachings, intention, and forms of aikido can be traced to the shift in training focus after the end of Ueshiba's seclusion in Iwama from 1942 to the mid-1950s, as he increasingly emphasized the spiritual and philosophical aspects of aikido. As a result, strikes to vital points by {{transliteration|ja|tori}}, entering ({{transliteration|ja|irimi}}) and initiation of techniques by {{transliteration|ja|tori}}, the distinction between {{transliteration|ja|omote}} (front side) and {{transliteration|ja|ura}} (back side) techniques, and the use of weapons, were all de-emphasized or eliminated from practice.<ref>{{Cite web|date=2017-05-06|title=The Ueshiba Legacy – Part 2, by Mark Murray|url=https://www.aikidosangenkai.org/blog/ueshiba-legacy-mark-murray-part-2/|access-date=2021-06-04|website=Aikido Sangenkai Blog|language=en-US}}</ref>

Conversely, some styles of aikido place less importance on the spiritual practices which were emphasized by Ueshiba. According to Minoru Shibata of ''Aikido Journal'':
<blockquote>O-Sensei's aikido was not a continuation and extension of the old and has a distinct discontinuity with past martial and philosophical concepts.<ref name="Shibata-Dilemma">{{cite journal| last = Shibata| first = Minoru J.| title = A Dilemma Deferred: An Identity Denied and Dismissed| journal = Aikido Journal | year = 2007| url = http://members.aikidojournal.com/public/a-dilemma-deferred-an-identity-denied-and-dismissed/| access-date = 2016-03-11| archive-url= https://web.archive.org/web/20071121231751/http://www.aikidojournal.com/article?articleID=263| archive-date= 2007-11-21 | url-status= live}}</ref></blockquote>

In other words, aikido practitioners who focus on aikido's roots in traditional {{transliteration|ja|[[jujutsu]]}} or {{transliteration|ja|[[kenjutsu]]}} are said to be diverging from what Ueshiba taught, as some critics urge practitioners:

<blockquote>[Ueshiba's] transcendence to the spiritual and universal reality were the fundamentals of the paradigm that he demonstrated.<ref name="Shibata-Dilemma"/></blockquote>

==References==
{{Clear}}
{{Reflist}}

==External links==
{{Sister project links|d=Q43114|n=no|b=no|s=no|voy=no|mw=no|species=no|wikt=aikido}}
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* [http://www.aikiweb.com AikiWeb Aikido Information] site on aikido, with essays, forums, gallery, reviews, columns, wiki and other information.
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