Ōuchi gari or large inner reap is part of the original 40 Judo throws introduced by Judo founder Jigoro Kano. This highly effective technique is classified as a foot technique, Ashi-Waza.
There are many set ups for Ouchi Gari, you have circular, frontal and with vaious grips. Here is version commonly used by Korean Judoka with an armpit grip and a higher grip with the right hand:
Judo great Kosei Inoue was also successfull with a similar Ouchi Gari but with a much stronger forward drive. Neil Adams explained Inoue’s version:
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