吸气，抬起上半身就好象要站起来一样，伸直手肘。

With an inhalation, lift your torso as if you were going to stand up again, straightening your elbows.

youdao

延伸手臂向前，保持手肘伸直。

Stretch arms forward, keep elbows straight.

youdao

你要拿起洗发水，手臂向上伸直，紧贴耳朵，然后只要将手肘向后弯曲90度，再将手肘伸直。

So you want to take your shampoo, hold your arm straight up, keep your arm right next to your ear, and then simply bend your elbow to ninety degree, and then lift it back up.

youdao