整个背贴着躺在地上，脚板放平在地板上，两手放在身体两侧。

Lie on your back, feet flat on the floor, knees bent, hands at your sides.

youdao

就是说放侧板在面板上面，然后是背板。

That's sides on the top, then the back.

youdao

就是说放侧板在面板上面，然后是背板。

That's sides on the top, then the back.

youdao