灵活、弯曲。
Notice how your ankles flex, how your calf muscles contract and how your knees bend.
留意你的踝关节如何曲伸，小腿肚上的肌肉如何收紧和膝关节如何弯曲。
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。
If you can't be getting up often, then stretch or bounce your legs, flex and extend your feet, bend your ankles from side to side. Even wiggling your toes will help.
如果你不能经常站起，那就伸展一下腿，动动脚，甚至动动你的脚趾都会有帮助。
The facet joints - also called zygapophysial joints - provide stability, while also allowing the spine to bend, flex, and twist.
关节突关节也叫做椎小关节，它提供脊柱稳定性，同时也允许其屈伸和扭转。
The facet joints - also called zygapophysial joints - provide stability, while also allowing the spine to bend, flex, and twist.
关节突关节也叫做椎小关节，它提供脊柱稳定性，同时也允许其屈伸和扭转。
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