The 100 lb. SpeedWeight Dumbbell Set is the ultimate in weight training convenience! You ll never have to buy another set of weights again! With a fast and easy adjustment, you can quickly select between 8 weight settings. 3 Phase workout plan Each workout, designed by a Certified Personal Trainer, delivers incredible results! Phase 1 will increase endurance. Phase 2 improves your strength and Phase 3 boosts your strength and power. Each workout targets different muscle groups for a total-body transformation!