求翻译：First, physical exercises can improve blood circulation, and remove the waste from the blood through sweating. Secondly, physical exercises can help give everyone a good appetite. Thirdly, physical exercises can help consume excessive fat in the body, preventing people from putting on too much weight, thus keeping them in good shape. Finally, after physical exercises we usually need a good rest and a sound sleep at night, refreshing us for the next day's work.是什么意思？

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