为避免受伤，逐步增加锻炼的持续时间。

To avoid injuries, increase the duration of your exercise gradually.

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记住要开始慢点然后逐渐增加锻炼的强度。

Remember to start slowly and build up intensity gradually.

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答案：当开始一种新的锻炼方法或增加锻炼频率或紧张程度时，有饥饿感是很正常的。

Answer: it's normal to feel hungry when you start a new exercise regimen or you increase your exercise frequency or intensity.

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