英语语法分析

You must not overexert yourself.

你不能过度劳累。

Hard to evenly, such as overexert, would stab scalp.

用力要均匀，如用力过猛，会刺伤头皮。

You shouldn't try to overexert yourself to reach a peak fitness level or train for a race.

你不可以用力过度来达到身体健康的巅峰状态，或者去为比赛而训练。