Although effort is required to bend a joint or flex a muscle, the body is able to recycle much of the energy expended through spring-like tendons and elegantly arranged muscles.

尽管需要花力气去弯曲关节或拉伸肌肉，但人体可以利用弹簧般的肌腱和分布优雅的肌肉来回收相当部分的能量。

youdao

But what they certainly advocated is that just as exercise is good for the body, so fasting is a spiritual exercise, allowing us to flex the muscles of the soul.

但他们肯定提倡的是，正如运动是对身体有益，因此禁食是一种精神锻炼，让我们灵魂的弯曲肌肉。

youdao

The unshod runners' style causes more flex in the foot's springlike arch ankle and knee and engages more foot and calf muscles blunting the impact on the body and making for a more comfortable "ride."

赤足的姿势引起了足部海面拱体、踝骨和膝盖更大的弯曲，更多地利用了足部和腿肚上的肌肉的力量，从而减弱了冲击对人体产生的影响，使人跑起来更舒服些。

youdao

The IS C suffers from body flex, which is most noticeable on rough surfaces.

FORBES: 2011 Lexus IS 350 C Test Drive and Review: Managing the Convertible Compromise

In this case, although there's plenty of flex in the Spyder's body, it's nowhere near as mushy as the last Sebring we drove.

FORBES: Overview

Read: Fitbit Flex: Will collecting data on your body make you healthier?

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