muscles tense

He takes a deep breath and feels his muscles tense , then relax .

他深深的呼吸着，发觉他的肌肉都绷紧了，然后又放松了。

When pain strikes , we attempt to keep the back as immobile as possible , which makes the muscles tense up .

当疼痛袭击，我们设法保持背部肌肉绷紧。

You know what happens when you 've been sitting at your desk too long : Your muscles tense up , your eyes glaze over , and your energy lags .

你知道长期端坐在办公桌前的恶果：紧绷的肌肉，呆滞的双眼和无精打采的自己。

When people get scared , their bodies automatically triggers the " fight or flight " responsetheir heart rates increase , they breathe faster , their muscles tense , and their attention focuses for quick and effective responses to threats .

当人们受到惊吓，他们的身体会自动启动“斗或逃”反应他们的心率升高、呼吸加快、肌肉紧缩、注意力随时准备快速有效地应对威胁。

All his muscles were tense , and his nerves and heart were all at the ready .

他浑身的肌肉都已绷紧，心脏和神经都充分调整过。

My body would never tire and my muscles would never tense .

我身体从不知疲乏，肌肉从不会紧张。

His muscles are hard and tense .

他的肌肉又僵又硬。