When you ride a bike, you exercise all of the leg muscles.
骑自行车时,你可以锻炼腿部的全部肌肉。
The exercise consists of stretching and contracting the leg muscles.
此项训练包括伸展和收缩腿部肌肉。
To stand, you have to tense your leg muscles, and engage the muscles of your back and shoulders; while standing, you often shift from leg to leg.
要站起来,你必须使你腿上的肌肉拉紧,你背上和肩上的肌肉也要参与;站着的时候,你的腿常常会转来转去。
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