Starting Procedure
Lie face-up on the floor with your arms at your sides and your heels on a stability ball.
Procedure
Keeping your legs straight and your toes pulled toward your shins, contract your glutes to raise your hips so your body forms a straight line from ankles to shoulders.
Lower back down and repeat for the prescribed number of repetitions.
Coaching Keys
Maintain a straight line from your head to your heels, keeping your torso engaged throughout the movement.
You Should Feel It
Working your glutes and to a lesser extent your hamstrings and lower back.