这些所谓的“通量绳’积蓄能量的方式与皮筋带被拉伸来积蓄能量的原理是一样的。

These so-called "flux ropes" build up energy in much the same way that an elastic band builds up energy as it's stretched.

youdao

腘绳肌(大腿后部肌群)拉伸练习。

5hamstring stretch (back of thighs).

youdao

通常，腘绳肌貌似意外的受伤，其根源都是长期的过度拉伸和休息不足导致的腘绳肌肌腱慢性劳损。

Often hamstring injuries that seem to occur suddenly are set up by a gradual weakening of the tendon over time, caused by overstretching and insufficient rest.

youdao