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碎片内容
英文对照:After tough workout or a day full of physical activity, it's common to find your muscles aching, but where do these pains come from? According to a German professor, the soreness comes from straining your muscles in an uncommon way, for example, jumping on a bicycle for a ride, because you haven't ridden in a long time. Soreness occurs since your leg muscles aren't used to that movement. When muscles perform an activity they aren't regularly expose to, the tiny fibers that are inside them are being torn apart.
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