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Koretoshi Maruyama
Koretoshi Maruyama (born 5 October 1936) is a Japanese people, Japanese aikido instructor and founder of Aikido Yuishinkai (合氣道唯心会), he was an uchideshi of aikido founder Morihei Ueshiba and also a student of Koichi Tohei. Aikido Koretoshi Maruyama first began studying aikido at the Aikikai Hombu Dojo in 1956 as well as training at the Keio University Aikido Club. After he graduated from Keio University, he continued his training in aikido, while working in the family business. In 1967 he delegated his responsibilities in the family business so that he could become a full time professional aikido instructor and he became an uchi deshi of Aikido Founder Morihei Ueshiba who awarded him the rank of 6th Dan in aikido.Koretoshi Maruyama
by Clement Choo, April 12th, 2010

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Japan
Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north toward the East China Sea, Philippine Sea, and Taiwan in the south. Japan is a part of the Ring of Fire, and spans Japanese archipelago, an archipelago of List of islands of Japan, 6852 islands covering ; the five main islands are Hokkaido, Honshu (the "mainland"), Shikoku, Kyushu, and Okinawa Island, Okinawa. Tokyo is the Capital of Japan, nation's capital and largest city, followed by Yokohama, Osaka, Nagoya, Sapporo, Fukuoka, Kobe, and Kyoto. Japan is the List of countries and dependencies by population, eleventh most populous country in the world, as well as one of the List of countries and dependencies by population density, most densely populated and Urbanization by country, urbanized. About three-fourths of Geography of Japan, the c ...
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Japanese People
The are an East Asian ethnic group native to the Japanese archipelago."人類学上は,旧石器時代あるいは縄文時代以来,現在の北海道〜沖縄諸島(南西諸島)に住んだ集団を祖先にもつ人々。" () Japanese people constitute 97.9% of the population of the country of Japan. Worldwide, approximately 129 million people are of Japanese descent; of these, approximately 122.5 million are residents of Japan. People of Japanese ancestry who live outside Japan are referred to as , the Japanese diaspora. Depending on the context, the term may be limited or not to mainland Japanese people, specifically the Yamato (as opposed to Ryukyuan and Ainu people). Japanese people are one of the largest ethnic groups in the world. In recent decades, there has also been an increase in the number of multiracial people with both Japanese and non-Japanese roots, including half Japanese people. History Theories of origins Archaeological evidence indi ...
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Aikido
Aikido ( , , , ) is a modern Japanese martial art that is split into many different styles, including Iwama Ryu, Iwama Shin Shin Aiki Shuren Kai, Shodokan Aikido, Yoshinkan, Renshinkai, Aikikai and Ki Aikido. Aikido is now practiced in around 140 countries. 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 that practitioners could use to defend themselves while also protecting their attackers from injury. Aikido is often translated as "the way of unifying (with) life energy" or as "the way of harmonious spirit". According to the founder's philosophy, the primary goal in the practice of aikido is to overcome oneself instead of cultivating violence or aggressiveness. Morihei Ueshiba used the phrase to refer to this principle. Aikido's fundamental principles include: (entering), , (breathing control), (triangular principle) and (turning) movements that redirect the oppo ...
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Morihei Ueshiba
was a Japanese martial artist and founder of the martial art of aikido. He is often referred to as "the founder" or , "Great Teacher/Old Teacher (old as opposed to ''waka (young) sensei'')". The son of a landowner from Tanabe, Ueshiba studied a number of martial arts in his youth, and served in the Japanese Army during the Russo-Japanese War. After being discharged in 1907, he moved to Hokkaidō as the head of a pioneer settlement; here he met and studied with Takeda Sōkaku, the founder of Daitō-ryū Aiki-jūjutsu. On leaving Hokkaido in 1919, Ueshiba joined the Ōmoto-kyō movement, a Shinto sect, in Ayabe, where he served as a martial arts instructor and opened his first dojo. He accompanied the head of the Ōmoto-kyō group, Onisaburo Deguchi, on an expedition to Mongolia in 1924, where they were captured by Chinese troops and returned to Japan. The following year, he had a profound spiritual experience, stating that, "a golden spirit sprang up from the ground, veil ...
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Aikido
Aikido ( , , , ) is a modern Japanese martial art that is split into many different styles, including Iwama Ryu, Iwama Shin Shin Aiki Shuren Kai, Shodokan Aikido, Yoshinkan, Renshinkai, Aikikai and Ki Aikido. Aikido is now practiced in around 140 countries. 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 that practitioners could use to defend themselves while also protecting their attackers from injury. Aikido is often translated as "the way of unifying (with) life energy" or as "the way of harmonious spirit". According to the founder's philosophy, the primary goal in the practice of aikido is to overcome oneself instead of cultivating violence or aggressiveness. Morihei Ueshiba used the phrase to refer to this principle. Aikido's fundamental principles include: (entering), , (breathing control), (triangular principle) and (turning) movements that redirect the oppo ...
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Aikido Yuishinkai
Aikido Yuishinkai (Japanese language, Japanese: ) is a style of aikido founded in 1996 by former Aikikai instructor and Ki no Kenkyukai president and chief instructor Koretoshi Maruyama. Aikido Yuishinkai has many dojos operating in Japan, Australia, New Zealand, Singapore, the Philippines, Argentina, the Netherlands, Germany, Denmark, the United Kingdom, Norway, and the United States. Koretoshi Maruyama was a personal student of the founder of aikido, Morihei Ueshiba, Morihei Ueshiba#Legacy, 4th generation, receiving a sixth dan, and today travels the world giving seminars. The school focuses on four levels of aikido technique and is influenced by the Daito Ryu and Shinkage-ryū sword style. In February 2016, Maruyama Sensei appointed Peter Kelly and Martijn van Hemmen as international instructors. In January 2019, he appointed Peter Kelly, tenth Dan, as international chief instructor. References

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Uchideshi
is a Japanese term for a live-in student/apprentice who trains under and assists a sensei on a full-time basis. The system exists in ''kabuki'', ''rakugo'', ''shogi'', '' igo'', ''aikido'', ''sumo'', ''karate'' and other modern Japanese martial arts. Lifestyle ''Uchi-deshi'' usually live in the dōjō or the home of the teacher, or in separate accommodations near the dōjō. The deshi serves the dojo every day. Duties may include cleaning and secretarial work. In contrast to ''uchi-deshi'', students who live outside are referred to as . Some dojo have uchideshi rooms right in the dojo. Historically, an ''uchi-deshi'' was typically chosen and groomed to become the next head of a school of martial arts when a direct family member was not available. Nowadays, the term is used synonymously as an apprenticeship. It can be a great option for a "gap year" or other period for self-discovery. Related terms In modern times, the role is also referred to as . Other terms include and ...
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Koichi Tohei
(20 January 1920 – 19 May 2011) was a 10th Dan aikidoka and founder of the Ki Society and its style of aikido, officially Shin Shin Toitsu Aikido (literally "aikido with mind and body unified"), but commonly known as Ki-Aikido. Aikido Koichi Tohei was born 1920 in Shitaya ward (下谷区), presently Taitō, in Tokyo and graduated from the Economics Department of Keio University. As a boy he was sickly and frail, leading his father to recommend Tohei for judo studies. He trained hard and his body prospered, but soon after he began his pre-college studies at Keio University, he developed a case of pleurisy. This forced Tohei to take a year off. Tohei was distressed at the thought of losing his newfound strength of body and his means of training it, so he decided to replace his judo studies with Zen meditation and misogi exercises, learned at the Ichikukai Dojo in Tokyo. As with his judo studies, Tohei entered the training of the mind with fervor and soon excelled despite his se ...
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Aikikai Hombu Dojo
The Aikikai is the original school of Aikido. It is centered on the Aikikai Foundation in Japan, and its figurehead is the Doshu (the family heir of the founder of Aikido). It is represented globally through the International Aikido Federation. Aikikai Foundation The is the original aikido organization. It has been an incorporated entity in Japan since 1940 under the name , then re-registered under the name "Aikikai" after the ban on Aikido practice was lifted by the GHQ in 1948. It is headed by the doshu, the living successor of the founder of aikido. In its name, ''Kai'' (会) simply means assembly or club. The Aikikai Foundation operates Hombu dojo, which is also named Aikido World Headquarters. It is sometimes called the Aikikai Hombu to distinguish it from the headquarters of later aikido organisations. It is located in Tokyo. The term "Hombu" may sometimes be used loosely to refer to the upper echelons of instructors at Hombu dojo, or to the Aikikai Foundation itself. ...
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Keio University
, mottoeng = The pen is mightier than the sword , type = Private research coeducational higher education institution , established = 1858 , founder = Yukichi Fukuzawa , endowment = N/A , president = Prof. Kohei Itoh , city = Minato , state = Tokyo , country = Japan , coor = , faculty = full time 2,791 , administrative_staff = full-time 3,216 , students = 33,437 , undergrad = 28,641 , postgrad = 4,796 , doctoral = 1,426excluding master course students as students in "Doctorate (prior)" , other_students = 0 In 2021, research students and auditors were not recruited due to the global epidemic of COVID‐19 (coronavirus disease). , campus = Urban , free_label = Athletics , free ...
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Aikikai
The Aikikai is the original school of Aikido. It is centered on the Aikikai#Aikikai Foundation, Aikikai Foundation in Japan, and its figurehead is the Aikikai#Doshu, Doshu (the family heir of the founder of Aikido). It is represented globally through the Aikikai#International Aikido Federation, International Aikido Federation. Aikikai Foundation The is the original aikido organization. It has been an incorporated entity in Japan since 1940 under the name , then re-registered under the name "Aikikai" after the ban on Aikido practice was lifted by the GHQ in 1948. It is headed by the doshu, the living successor of the founder of aikido. In its name, ''Kai'' (会) simply means assembly or club. The Aikikai Foundation operates Aikikai#Hombu dojo, Hombu dojo, which is also named Aikido World Headquarters. It is sometimes called the Aikikai Hombu to distinguish it from the headquarters of later aikido organisations. It is located in Tokyo. The term "Hombu" may sometimes be Metonym, ...
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Ki No Kenkyukai
The is an aikido organization founded by Koichi Tohei in 1971, while he was the chief instructor at the Aikikai Hombu Dojo. The official Japanese name of the organization is Shin Shin Toitsu Aikido Kai (心身統一合気道会), but it is also known in English-speaking countries as "Ki Society". Its foundation reflected Tohei's differences with the Aikikai, and his own emphasis on developing the concept of Ki. Students of the art are graded in Ki and Aikido classes. Tohei's Ki lessons come from Shin Shin Tōitsu-dō (心身統一道), meaning "the way of realizing the riginalunity of mind and body". The martial discipline of the art is frequently referred to as Ki-Aikido, particularly in the Western world. The Ki Society has its organizational headquarters in Chiyoda-ku in central Tokyo, and its head dojo at the Tenshinkan in Tochigi Prefecture, a large facility built on the Tohei family ancestral land. Principles and Practice At the Ki Society, Tohei envisioned a place where ...
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