Exercise, on the other hand, is a structured and repetitive form of physical activity that you do on a regular basis.

锻炼，从另一个方面来讲，是一种结构化和重复的身体活动形式，前提是该活动要定期进行。

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But according to the latest research, even when people do significant and regular exercise, they still increase their risks of serious illness from hours of physical inactivity.

CNN: Sitting for hours can shave years off life