How to: Using a 55cm or 65cm stability ball, place both shins on the top center of the ball with hands on the floor directly beneath your shoulders. Begin in an elevated plank position with legs fully extended. Keep your navel drawn-in & tuck your knees toward your chest, allow the hips to slightly elevate and spine to round slightly. Return back to starting position.
Compensations: Watch for rounding and elevating of your shoulders. Dropping head & neck. Arching of lower back and rushing the movement.