Running fast while fatigued forces your body to recruit muscle fibers that might otherwise go untrained.

在疲劳状态下快速奔跑会促使你的肌肉纤维得到增强，否则就得不到锻炼。

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Small breaks help to prevent your mind and body from becoming fatigued, a major source of stress.

短时间的休息能防止你身心俱疲，这也是压力的重要来源。

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Feeling fatigued, sluggish, and physically drained. Your whole body may feel heavy, and even small tasks are exhausting or take longer to complete.

感觉疲劳、呆滞，而且身体无力。你感觉整个身体很重，甚至一点小活都会让你感到精疲力尽或需要很长时间才能完成。

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