One-Legged Squat

How to do it: 

Stand with your feet hip-width apart, knees slightly bent, and shoulders unhunched. Hold the back of a chair or the arm of a couch for balance.
Bend your left knee 90 degrees (shown).
Keep your left foot raised behind you throughout the exercise. Make sure your right knee remains directly over the right foot. Squat.
Repetitions: Do eight reps on each side.

Bonus benefit: improve your balance.

单腿下蹲

要点：双脚站立，臀部同宽，膝盖微微弯曲肩膀下沉。握住椅背上或沙发扶手，保持平衡。
左膝弯曲90度。
向后抬起左脚。确保右腿膝盖和右脚在一条直线上。下蹲。
重复：每边做八个代表。

好处：提高你的平衡力。