There is a natural curvature in the neck, a lordosis, and you can lose that and develop something called flat neck syndrome.

颈部有一处弯曲，一处前凸，这个前凸可能会消失，同时你也会患上平颈综合症。

It's anatomical name is the lumbar lordosis.

它的解剖学名称是腰椎前凸。

They have a lot more lordosis than the- So arching runners.

们的腰椎前凸程度比拱形跑者要大得。

If you can pre-turn the pelvis with a lot of lordosis in the spine, you get much more power development behind the center of mass through the extensor range.

如果你能在脊柱呈现明显前凸的情况下预先转动骨盆，便能在伸展范围内获得更重心之后的动力发展。

Do you think they have a flat lower back or do you think they have a lot of lordosis, which is an extension hollow in their low back?

你认为们的下背部是平直的，还是你觉得们有明显的腰椎前凸，即下背部呈现出一个凹陷的弧度？

If you're a gymnast or you swim the butterfly for instance, you're putting your lumbar lordosis through some intense pressure and wear and tear.

如果是体操运动员或蝶泳运动员，们的腰椎前凸就会受到很大的压力和磨损。