You look at the lumbar extensor muscles.

看看腰部伸肌。

Also, other studies showed flexibility improvements in areas like the knees, hips, and back extensors.

此，其他研究显膝盖、臀部和背部伸肌等区域的柔韧性也得到了改善。

The common fibular nerve is in charge of the muscles in the anterior and lateral compartments of the leg, and intrinsic extensors of the foot.

腓总神经支配小腿前部和侧部的肌肉，以及足部的固有伸肌。

They don't really have so many of the extensor muscles that are the weight-bearing muscles; instead, they rely on retractor muscles to pull themselves along.

他们实际上并没有那么多作为负重肌肉的伸肌；相反， 他们依靠牵开器肌肉来拉。

One muscle of each pair is called the flexor. It bends a joint and brings a limb closer to the body. The other muscle, the extensor, does the opposite.

每一对肌肉中的一块肌被叫做屈肌。它可使关节弯曲并使这部分肢体更靠近躯体。另一块肌肉即伸肌，作用相反。