Stand parallel to the back of a sturdy chair with the hand closest to the chair resting on it, feet parallel and hip-distance apart.
With your toes and knees turned out to 45 degrees, pull your belly button up and in. Bend your knees, lowering your torso as low as possible while keeping your back straight [shown]. Straighten your legs to return to starting position. Repeat for reps.
Strengthens: Quadriceps, hamstrings and butt. Improves balance.