A bath can relax tense muscles.
泡个澡能放松紧绷的肌肉。
Allow your muscles to relax completely.
让你的肌肉完全放松。
A massage will relax those tense muscles.
按摩会使紧张的肌肉松弛。
The massage relaxed my tense back muscles.
按摩使得我背部紧张的肌肉松弛下来。
His muscles tensed as he got ready to run.
他准备起跑时肌肉绷紧了。
The heart muscles contract to expel the blood.
心脏肌肉收缩以挤压出血液。
It is better to stretch the tight muscles first.
最好先舒展一下僵硬的肌肉。
I jump, intensifying the pain in all my muscles.
我跳起来，浑身的肌肉更加疼痛了。
He slowly flexed his muscles and tried to stand.
他缓慢地活动了一下肌肉，想站起来。
He stood on the side of the pool flexing his muscles.
他站在游泳池旁活动肌肉。
This exercise will work the muscles of the lower back.
这样的运动可以锻炼腰部的肌肉。
You need to release the tension in these shoulder muscles.
你需要放松肩部肌肉。
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 blood supply to the skin is reduced when muscles stiffen.
肌肉发僵时，皮肤的供血量就会减少。
The exercises are designed to stretch and tone your leg muscles.
这些活动目的在于伸展和增强你的腿部肌肉。
You should try not to place too much strain on muscles and joints.
你要尽量不让肌肉和关节太吃力。
Cycling is good exercise. It strengthens all the muscles of the body.
骑车是好的锻炼。它使全身肌肉变得强健。
She has always been encouraged to swim to build up the strength of her muscles.
她总是被鼓励去游泳以增强肌肉力量。
You can feel it in your bones and muscles.
你可以从你的骨骼和肌肉中感受到它。
Muscles can improve people's ability to laugh.
肌肉可以提高人们笑的能力。
Each one of these sacks is controlled by muscles.
每一个麻布袋都是由肌肉控制的。
First, the body must realize the muscles are damaged.
首先，身体必须意识到肌肉受到了伤害。
How do our 200 muscles work together when we take a step?
当我们迈一步时，我们体内的两百块肌肉是如何协同工作的？
However, most of its internal heat comes from the action of its muscles.
然而，它的大部分内热来自肌肉活动。
When my hand lay on her calf, I felt the constant twitching play of muscles.
当我的手放在她的小腿上时，我感觉到肌肉不断地在抽搐。
To avoid knee pain, you can run on soft surfaces to strengthen your leg muscles.
为避免膝盖疼痛，您可以在柔软的平面上跑步以增强腿部肌肉。
My muscles had stiffened up after the climb.
爬上去以后我两腿都发僵了。
One group of muscles sets the next group in motion.
一组肌肉带动下一组肌肉运动。
This treatment helps tone the body, firm up muscles and tighten the skin.
这种治疗可以帮助保持体态，使肌肉变结实、皮肤紧致。
I must take some exercise and loosen up my muscles.
我必须运动一下，放松放松肌肉。
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