Stand on a bench or box that's about knee height. Hold your arms in front of you and flex your right ankle so your toes are higher than your heel. Keeping your torso as upright as possible, bend your left knee and slowly lower your body until your right heel lightly touches the floor. Pause for 1 second, then push yourself up. That's one repetition.
Single-Leg Squat
Stand with your legs shoulder-width apart and then raise your right leg in front of you as high as you can [1]. Bend your hips and left knee and lower your body as far as you can [2]. Reverse the motion to return to the starting position. That's one rep. Perform reps, and then repeat on the opposite leg.