When we are under stress our bodies tend to tense up.

人一紧张，身体就会变僵硬。

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I tried not to tense up, or become obviously wary.

我尽量不让自己紧张，或者表现得非常警觉。

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Tense up the muscles in both of your legs.

把两腿的肌肉绷紧。

柯林斯例句

Work swiftly, but don't tense up; relax your body and mind and never tighten up.

工作要赶不要急, 身心要松不要紧.

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She could feel herself tense up as he touched her arm.

他碰她胳膊时,她感觉自己紧张得不得了.

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If you tense up, you can snap just like a dry branch.

如果你太紧张的话, 你就会象干树枝一样断掉.

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