So when they sit down, these objects put pressure on the gluteus muscles, which can compress the sciatic nerve, causing sciatica.

所以当他们坐下时，这些物体会对臀肌施加压力，这可导致坐骨神经受压迫，引起坐骨神经痛。

So the gluteus maximus plays a very important role when you're— when you're running, and turns out to barely be active when you're walking.

因此，当你跑步时，臀大肌起着非常重要的作用，而当你走路时，臀大肌几乎不活跃。

And so your gluteus maximus fires just before your body's about to—your trunk is about to pitch forward and make you hit your nose on the ground, and it helps pull your trunk backward.

因此，在你的身体即将前倾并让你的鼻子撞到地面之前，你的臀大肌就会启动，这有助于将你的躯干向后拉。

And the other time the gluteus maximus fires is when your leg is swinging forward when you're in the air, and it helps decelerate the leg so that you bring your leg down onto the ground.

另一次，当你在空中时，当你的腿向前摆动时，臀大肌就会发火，这有助于使腿减速，以便你将腿落到地面上。

And it turns out that very nicely we can see when the gluteus maximus got big in human evolution because its upper portion, the portion that's really important for this function, leaves a trace on the pelvis, on the bone.

事实证明，我们可以很好地看到臀大肌在人类进化过程中何时变大，因为它的上部，即对该功能非常重要的部分，在骨盆和骨骼上留下了痕迹。