Clam Shell

START: Lie on your left side on the floor, with your hips and knees bent 45-degrees. Your right leg should be on top of your left leg, your heels together. Rest your head on your left arm.

MOVEMENT: Keeping both feet in contact with each other, raise your right knee as high as you can without moving your pelvis or allowing your left leg to move off the floor. Squeeze your right glute as you lift your knee. Pause, then return to the starting position and repeat. Do all your reps, then turn over and repeat with your left leg.