All I can tell you is that this really works for me. I started out with the one-mile without the weighted balls, now do the two-mile every day before work and the three-mile on weekends. I've lost 25 lbs, two pants sizes, feel better, have better posture and more energy. The workouts are easy enough that I don't get lost with all the steps (like some other videos), but it's less boring and works more muscles than just riding an excercise bike or treadmill.