bodyweight squat
-stand with feet parallel and directly below the hips.
-slowly lower your hips as though you're about to sit in a chair behind you.
-concentrate on tightening your stomach muscles. Avoid arching your lower back.
-keep your knees hip-distance apart, above your feet, so the movement is concentrated in your thighs and buttocks.
-the movement should be as deep as your feet you can control.
-repeat five times.