Hiroo Mochizuki

Yoseikan Budo (養正館武道) may be classified as a sōgō budō form (総合武道, "composite" or "comprehensive" martial art), but is used here to indicate a martial art into which various martial ways have been integrated. It is probably most widely known for its connection to a pre-war style of aikido; however, it has important connections to judo, karate, western boxing, savate and a traditional form of Japanese armed combat known as Tenshin Shōden Katori Shintō-ryū.

The name of the art yō-sei-kan is derived from three Japanese characters, yō meaning 'teaching', sei meaning "truth", kan meaning "place", which may be translated roughly into English as "the place where the truth is taught" or alternately "place for practising what is right". The intent of the name was not to assert an exclusive possession of the truth regarding the martial arts but rather to describe how the comprehensive nature of the yoseikan training environment allows an individual to discover their own sense of "truth" by studying a wide range of differing martial techniques, philosophies and principles.

Yoseikan Budo originated in 1931 as the style created by its founder Minoru Mochizuki (1907–2003), a high ranking student and assistant to Kanō Jigorō, the founder of judo and Morihei Ueshiba, the founder of aikido, in the pre-World War II period. In addition to the very high ranks he held in these arts he was student of one of the oldest styles of traditional Japanese koryū budō, the Katori Shintō-ryō, and studied with various karate teachers including Gichin Funakoshi, the man who brought karate from the Okinawan islands of mainland Japan.

The old Yoseikan style included mainly jujutsu, aikijujutsu, kobudo and a few karate techniques, such as: foot sweeps and trips (ashi waza), standing throws (nage waza) and groundwork (ne waza); punches, kicking and blocking techniques (kihon te waza, kihon uke waza, kihon geri waza); escapes (te hodoki), joints locks, bending or twisting (kansetsu waza), variation techniques (henka waza); sword, sticks and knife techniques; counter techniques (ura waza), chokes (shime waza) and exclusive sacrifice techniques (sutemi waza) as well as a number of solo and paired katas with and without weapons.

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