Empower Zobi with DVD A better, more ergonomic shape that is easier to grip 9lb weighted Zobi perfect for both cardio and strength workouts Zobi's unique shape makes it more unbalanced & destabilizing thus more than 25% more effective than using a symmetrical weighted ball 300 calorie burning 30- minute workouts; mix and match 5 different workouts that include muscle conditioning, cardio, and core training Includes one, 9lb, sand filled Zobi, workout DVD, and workout guide