拉伸是否可以预防受伤是难以确认的，如果你拉伸太多，或过度，事实上会增加你受伤的风险。

Whether or not stretching prevents injuries is difficult to prove. If you stretch too much, or too hard, you actually can increase your risk of injury.

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同样拉伸的时候不要蹦跳，以静态位置保持拉伸姿势最好。

Also, don't bounce while stretching. Holding your stretch in a static position works best.

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不要过度拉伸：尽管拉伸可以提高柔韧性，拉伸太过会伤害你的肌肉——尤其当你正从损伤中恢复的时候。

Don't Overstretch: While stretching can promote flexibility, stretching too far actually can damage the muscles-particularly if you're recovering form an injury.

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If you connect the body to a spring, which is neither compressed nor extended, there's no force acting on it.

如果将一个弹簧连在这个物体上,弹簧既没有被压缩也没有被拉伸,也不会有力作用在它上面

耶鲁公开课 - 基础物理课程节选

Newton is not going to come and tell you what force the spring will exert when it's pulled by some amount.

牛顿不会过来告诉你,弹簧被拉伸一定量时会产生多大的力

耶鲁公开课 - 基础物理课程节选

I draw a graph here of the amount by which I pull the spring versus the force it exerts.

我在这里画个图,纵轴是弹簧的拉伸量,横轴是力的大小

耶鲁公开课 - 基础物理课程节选