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From JAWiki

[edit] Kick so as to not be Kicked

This technique simply involves crouching down and using kick, timely, against opponents. While you are crouching, you will not be knocked back by their kick. You can still be kicked when you get up to kick yourself, but if you are holding down crouch you should usually be safe unless they are lucky with their timing.

Note: Punches are unaffected by this technique, but they are weak anyway, so don't worry.