degree of bend 弯曲角度
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.
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。
Extras for experts: Brace your hands against the back of a sofa and bend over at a 90-degree Angle.
专家支招：双手撑着沙发背，身体呈90度角弯曲。
Instead, you should perform "short-arc" exercises where you only bend your knees to the degree shown in these pictures.
反之，你应该做“短弧”练习，你只能如图示程度弯曲你的膝盖。
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