据一个德国教授说，疼痛来自以不平常的方式拉伸你的肌肉，例如，骑上自行车兜风会疼痛，因为你已经很长时间没骑车了。
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.
一个德国教授认为，肌肉酸痛是因为肌肉拉伸的方式与平常有所不同，例如，长时间没有骑自行车之后再骑车兜风就会产生肌肉酸痛。
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.
每周至少做四次有氧锻炼，例如慢跑、骑车和游泳，每次30分钟。
Do aerobic exercise for a minimum of four days per week, 30 minutes at a time. Some examples of aerobic exercise include running, biking and swimming.
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