The muscles in her back tightened, pulling down from her spine and causing her back to arc slightly.
她后背上的肌肉绷紧着，使她脊梁骨向下沉，背部有点弯成了一个弧形。
This puts strain on the muscles in the front of your leg, which unfortunately are not strong enough to resist the pulling. Ouch.
由于你连在脚踵上的小腿腓肠肌紧张而无法伸展，引起脚趾被拉低，这让你小腿正面的肌肉受到压力，而你小腿正面肌肉还无法对抗这种拉力，好疼！
If you slouch forward when you run, you may be pulling too hard on your calf muscles.
如果跑的时候向前弯腰，那你的腓肠肌会拉伸过量。
To stretch your muscles effectively, you should move gently into the stretch until you feel a slight pulling - but never pain.
为了达到有效拉伸肌肉的目的，练习时动作不要过猛，感到有轻微的拉胀感即可——决不可有疼痛的感觉发生。
Then they use either heat or an air pump to create suction between the cup and the skin, pulling the skin slightly up and away from the underlying muscles.
然后通过加热或抽气，让杯子和皮肤之间产生吸力，然后把皮肤从下层肌肉轻轻拉起。
Muscles move bones by pulling on tendons.
肌肉是通过拉动腱而使骨头活动的。
The main type of the injury is the acute one, for example, the sprain of the joint ligaments and the pulling of the muscles.
损伤的类型主要为急性闭合性损伤，以关节韧带扭伤、肌肉拉伤为主；
If you see a motion pulling other muscles that shouldn't be moving, back off a little, and freeze it at that point, and relax the muscles that shouldn't be moving.
如果你看到一个动作拉扯到了其他不该动的肌肉，往回收一点，然后停在那里，放松那些本来不该动的肌肉。
The action of muscles pulling on bones during exercise is thought to produce "healthy" strain on the skeleton that stimulates the production of new bone, the investigators note.
调查者表示运动时肌肉牵拉骨骼的动作被认为是引起骨骼产生“健康”劳损，刺激新骨的生长。
'You can burn up to 130 calories an hour on a shopping trip, ' says Healy. 'All that contorting and pulling items on and off is good for stretching muscles and increasing blood flow, too.
希利说：“一次逛街每小时可消耗最多130卡热量。 试衣服不时地伸手弯腰的所有动作都有利于伸展肌肉，促进血液流通。”
'You can burn up to 130 calories an hour on a shopping trip, ' says Healy. 'All that contorting and pulling items on and off is good for stretching muscles and increasing blood flow, too.
希利说：“一次逛街每小时可消耗最多130卡热量。 试衣服不时地伸手弯腰的所有动作都有利于伸展肌肉，促进血液流通。”
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