The Core Secrets® program helps you burn more calories, tone more muscle groups, and melt away more inches–more efficiently than traditional exercise programs. How? When you alternate exercises between the upper and lower body, your heart and lungs have to work harder to send blood through to these major muscle groups at opposite ends of the body – burning more calories than you would with weight lifting or aerobics alone. Plus, since your entire workout is done on the Fitness Ball, your core muscles are engaged during every exercise just to maintain your balance. What's more, thanks to constant mobility, your muscles have to fire differently each time you do it–so your workout always stays challenging, fresh and fun.