You look at the lumbar extensor muscles.

看看腰部。

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

此，其他研究显示膝盖、臀部和背部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肉，以及足部的固有。

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.

他们并没有那么多作为负重肉的；相反， 他们依靠牵开器肉来拉动自己。

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.

每一对肉中的一块被叫做屈。它可使关节弯曲并使这部分肢体更靠近躯体。另一块肉即，作用相反。