当时间通常很紧张的时候，参与一项快速的锻炼往往很有帮助。
Quick Workouts . When time is unusually tight, planning a quick workout can help.
节奏快速且节拍连续的音乐很适合用于锻炼。
Music with a quick and continuing beat is good for exercising.
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。
Running fast while fatigued forces your body to recruit muscle fibers that might otherwise go untrained.
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