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In this paper we are interested, both: at the description of Biomechanics ofthe Ashi Waza techniques, with precision of few of them, members of theJapanese, so called, Ko Waza group; and at the biomechanical analysis of thesmall changes in the applicative form of them. These small changes, from thebasic movement defined by Kodokan and show in thousand books, probably bornfrom practical competitive situations. They are today become the usualapplicative form, not only present among the various National Federations, butalso in Japan itself among Universities dojos and the Kodokan. Among the KoWaza techniques, we will select for our analysis only the following: Ko UchiGari , Ko Soto Gari, Ko Uchi Barai, Ko Soto Barai, Ko Soto Gake , Ko Uchi GakeThat are considered by Japanese followers different throwing techniques, as thedifferent names show us. But from the Biomechanical point of view all theseKodokan throws are based on the same physical principle and practically on thesame movements.

The increasing importance of Ashi Waza, in high level competition. (Their Biomechanics, and small changes in the form)