The ability of the flexor muscles to stretch decreases with age;
屈肌肌肉拉伸的能力随着年龄下降；
Hours in the car or at a desk cause hip flexor muscles to shorten and stay tight.
在汽车或桌子前一坐几个小时使你的股屈肌缩短变硬。
As runners, triathletes need to recognize the importance of strengthening our hip flexor muscles.
作为一个跑步者，三项赛的需要让我们认识到臀大肌的重要性。
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