The massage relaxed my tense back muscles.
按摩使得我背部紧张的肌肉松弛下来。
This exercise will work the muscles of the lower back.
这样的运动可以锻炼腰部的肌肉。
That way your back muscles are prepared for the shock of the backward pull.
这样你的背部肌肉就为弓起身子做好了准备。
The hamstrings are three long muscles that cover the back of the thighs.
腘绳肌是覆盖大腿后侧的三条长条形肌肉。
Take a quick break during the day to work the triceps, chest muscles and back.
稍作休息后开始锻炼三头肌、胸肌和背部。
Use your leg muscles - not your back - to lift the object.
用你的腿部肌肉——不是背部——去抬起物品。
Maintain the natural curve in your lower back, and keep your core muscles tight.
保持腰背部的自然弯曲，保持收紧你的核心肌肉。
Strong and flexible muscles help keep your back in shape.
强健和强柔韧性的肌肉能使后背保持良好的形态。
This exercise is designed to develop the shoulder and back muscles.
这种运动旨在锻炼肩部和背部肌肉。
This will cause strain on your back and neck muscles.
这会对背部及颈部肌肉造成压力。
All tension is being dissolved away from the muscles down the back of your neck.
所有的紧张压力都消失了，随着你身体脖子后的肌肉放松而消失了。
You need to use your back muscles to swim the butterfly-stroke.
你必须用你背部的肌肉来游蝶泳。
Movements that put stress on the back can result in pulled muscles.
腰部受力的活动可能导致肌肉拉伤。
Movements that put stress on the back can result in pulled muscles.
腰部受力的活动可能导致肌肉拉伤。
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