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I think that the book basically said that the muscles push against each other as you move your body, thus they're working out. Now I tried it lastnight and I felt my arms as if I was working them out, or at least I think that's what I thought I felt. So I think it's using muscles that correspond with each other against each other, like if your lifting with your arms it's using the biceps in the front to work against your triceps in the back of your arm (at least I think that's what muscles, I'm probably wrong).
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