这些目标肌群应该处于放松的状态，这意味着当你在伸展某个肌群的时候，那部分肌肉不应有任何形式的负担。
The targeted muscle should be in a relaxed state, meaning the muscle should not be working to support you in any way while you are stretching it.
在你的肾盂附近，存在着一组被称为耻尾肌的肌肉(即pc肌)。
In your pelvis area, there exists a set of muscles, known as the Pubococcygeus (PC) muscles.
他的二头肌上扎着一条带子，小臂里扎进去一个注射器。
A belt was cinched at his biceps and a syringe protruded from his forearm.
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