HOW: Place a BOSU ball on the ground with the blue side down. Grab onto each side with your arms underneath your shoulders, your legs straight out from your hips and your toes pushing into the ground with a flat back. From this plank position, roll the edge of the ball around in a clockwise or counterclockwise direction while maintaining the plank position.
FEEL: You should feel your shoulder and core muscles working.
COMPENSATION: Don’t arch your back, keep it flat with your core engaged.