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Anonymous
Lol, saw this question earlier but had no input. Guess nobody else does, either.
Since I'm already posting, I'll just say that 1) doing that is probably hard on your joints (but good for yer bones) and 2) the shock is not a contraction but your muscles literally being jarred. You MIGHT get a good contraction in your quads, but the rest is just the energy of your feet slamming into the ground reverberating around your legs.
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