These workouts are fantastic. They work you really hard but are not all jumping about. They really work your muscles, and are toning you all the time you are burning calories. Ideal. Billy is a really nice presenter, and seems to be a genuinely nice man. Other reviewers have commented about some of the workouts being the same, but as this is the first Tae Bo DVD's I have bought, (and it was good value for 4 discs) it didn't really matter to me. The first time I did the advanced session I could not believe how many calories my heart rate monitor had said I'd burned. I always had to be running before to produce this, so I think that as I get older this will certainly be gentler on the knees and joints, but just as good for weight control. I could not recommend this enough. Even if you are not fit, you can start with the basic workout and work your way up. As soon as you see how much good it is doing you, you will soon have the motivation to work towards the advanced workouts.