The Importance of Seiza in the Martial Arts
In addition to being a meditative position, as in zazen (seated meditation), seiza is the traditional manner of sitting in a variety of traditional Japanese martial arts, such as kendo, iaido, judo, jujitsu, karate, nunjutsu, as well as activities such as ikebana (flower arranging) and shodo (calligraphy).

The site below lists detailed instructions for seiza as it relates to Japanese martial arts.
Link: Seiza No Kamae – Ninjutsu
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