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There used to be an ideal in judo (it may still exist, though I've long had a sinking suspicion that it is not actually ideal) that for a throw to be perfect ("ippon") it has to happen fast, uke has to hit the mat hard, and tori must be in control. - Hard, Fast, and Control was the recipe for an ippon. Now I think for a throwing-type technique to be good enough, uke must descend to the ground and tori must remain in control throughout and after. I don't care about hard and fast because hard is arbitrary and abusive and fast is irrelevant (acceleration due to gravity is a constant 32 feet per second per second or about 22mph per second.)
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I suspect that pushing down on uke as he falls does not increase his speed much - it just increases his effective mass so it hurts more.
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When I see a demonstration of aikido or judo, and it looks super-fast, that does not make me think, "That is super-realistic." It makes me think, "Something is wrong with that demo." Just about the only way to make an un-realistically fast technique work is to have a overly-compliant uke.
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So anyway, When you're demonstrating something in "real time" or at "real speed," that is not arbitrarily fast. That's part of why I like this demo so much. It is real-time.
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Patrick Parker
www.mokurendojo.com