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Muscles work together in so that your body can move. As one muscle , the other relaxes. Muscles push; they always . When the muscles on the back of your upper leg contract, they and pull your lower leg back and up. When you straighten your leg, the muscles on the back of your upper leg and lengthen, and the muscles on the front of your upper leg .
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Muscles work together in so that your body can move. As one muscle , the other relaxes. Muscles pu...
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