Build core strength and stabilization with this dynamic plank exercise. By using the ball, you'll engage your deepest abdominal muscles.
How to do it: Get into plank position with your feet hip-width apart on the floor and your forearms on the Swiss ball, hands clasped. Brace your abs in tight and begin to trace a clockwise circle with your elbows, pressing your forearms into the ball during the entire movement. Try to keep your body as steady as you can, and don’t let your chest rest on the ball. Complete 15 circles total, alternating the direction of your circle with each rep.