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Now, what is it that causes that, mechanically,
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that transition to take place?
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What's different about running than walking?
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Well, one of the things that's different is
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that you don't always have one foot on the ground when you're running.
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In fact, if you watch somebody run or you run yourself,
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you'll know that for a lot of the time you're only--
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you're not--no foot's on the ground.
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There's not time that both feet are on the ground,
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one foot hits, you sort of bounce off of it,
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you bounce off the other one,
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you bounce off the other one,