In this video, Yuri Elkaim teaches three abdominal exercises on a stability ball. First, he demonstrates a variation of the plank exercise, rolling back and forth on the ball, and then two other exercises. Learn tips on how to do these exercises correctly to be safe and avoid injury. You will also learn ideas for an abs workout routine. Learn these interesting and challenging exercises for a stronger core and better defined abs. This video will teach you a new workout routine (or just new exercises to add/interchange with your regular workout), and teach you how to perform it safely and effectively.