伸直膝盖，大腿上方向内卷。
伸直膝盖但不要锁住膝盖。
股四头肌帮助伸直膝盖。
股四头肌前侧和后侧收缩，伸直膝盖、伸展腘旁肌下部。
The front and back leg quadriceps contract, extending the knees and stretching the lower region of the hamstrings.
预防上腘绳肌肌腱损伤，你需要渐进式地练习伸直膝盖的前屈，并且对一切坐骨区域的疼痛保持高度警惕。
To prevent an upper-hamstring injury, you need to approach straight-leg forward bends gradually and with awareness, taking any pain near the sitting bone seriously.
不管你用哪种方式，移动小腿骨恰到好处地伸直膝盖，不再让膝关节往后弯，但也不要太高以免膝关节向前弯。
Whichever approach you take, move the shinbone just enough to straighten the knee so that it no longer curves back, but not so much that the knee bends forward.
再如，倾向他，双脚并起，双手放在膝盖，胳膊伸直：他会很喜欢这种姿态的。
Also, lean forward toward him, feet together, hands on knees, arms straight: he'll enjoy the perspective.
伸直抬腿——平躺，一条腿伸直，另一条腿膝盖弯曲。
Straight leg Raises - Lie on your back with one leg straight and one knee bent.
股四头肌使后腿膝盖伸直。
股四头肌使大腿肌肉向下缩短，膝盖伸直。
The quadriceps muscles down the front of the thighs shorten to straighten the knees.
股四头肌和大腿前侧使膝盖伸直。
The quadriceps along the front of the thigh straightens the knee.
在那著名的古庙里，站立着一尊高大的塑像，人在他的旁边，伸直了手还摸不到他的膝盖。
In the famous ancient temples stood a huge statue, it was too high for a man to reach the knee even with his arms stretching out.
股四头肌伸展直腿，使膝盖保持在伸直状态。
注意膝盖不要超过脚尖，尽量保持左腿伸直。
Make sure your right knee does not extend past your toes and keep your left leg relatively straight.
膝盖也可能会失去机动性，如果弯的时间太长就可能无法伸直。俯卧也可以预防膝盖僵硬。
Knees too can lose flexibility and if bent for long periods can result in an inability to straighten fully. Prone lying will help to prevent this.
它同时帮助膝盖伸直。
达顿普夫人满足地站了起来伸直了膝盖，像一个按时完成了早晨对神明祷告的帕西人女祭司。
Drabdump rose from her knees content, like a Parsee priestess who had duly paid her morning devotions to her deity.
最终，你或许就可以用腿部伸直的站姿，膝盖不触碰地面的方式来完成健腹轮的训练。
Eventually you will be able to do the straight legged version of the exercise where your knees are not touching the floor.
股四头肌处于大腿前侧，有力收缩使膝盖伸直。
The quadriceps muscles along the front of the thigh firmly contract to straighten the knees.
随着呼气，推动大腿上端的后侧，脚跟伸展落向地面，膝盖柔和伸直但注意不要锁紧膝盖。
Then with an exhalation, push your top thighs back and stretch your heels onto or down toward the floor. Straighten your knees but be sure not to lock them.
随着呼气，推动大腿上端的后侧，脚跟伸展落向地面，膝盖柔和伸直但注意不要锁紧膝盖。
Then with an exhalation, push your top thighs back and stretch your heels onto or down toward the floor. Straighten your knees but be sure not to lock them.
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