Weighted stabilizing technology keeps ball in place! Tone, tighten and build rock-hard abs with Reebok"s Stability Ball Workout Kit. We designed this non-stop workout with cardio drills and strength training moves to take advantage of the weighted ball"s innovative design. Because it stays put when you don"t, we"ve added new, leading-edge moves that go further and deeper than other ball workouts. The 60-minute workout DVD alternates cardio with strength training, giving you a full-body challenge and an all-over body-shaping experience. And through it all, Reebok"s premium burst-resistant ball stays in place!