These are two fun and challenging cardio sculpt workouts. The first alternates weights and cardio movements in a circuit to keep aerobic intensity. Although you can change the intensity based on your weight choices, the overall effect is to keep your heart at a steady, but elevated, rate. The second workout alternates between steady state cardio, cardio interval blasts and fast-paced sculpting. You could probably do the first workout every day if you went light with the weights, but you wouldn't want to do the interval workout as often.
The pace of both workouts is such that you could probably go to tens or even twelves for some of the sculpting in the first workout, but I wouldn't go heavier than eights for the second. I think it's funny that so many people have remarked that the workouts aren't challenging enough because the intensity is so easy to change with weights. I also feel like I get a lot done in a really short period of time because of the emphasis on functional movements, particularly the plank variations and one-legged squats and lunges.
The three add-on "parts" segments are also really effective because of the functional movements. The abs section, very reminiscent of Pilates, is my favorite.
As for the instructors, these are pros from many other DVDs. Dozois and York are very professional, but Wheeler I am actually in awe of. She has been affiliated with the Method, Reebok, Denise Austin and now Shape. She is very knowledgable, and that comes through. However, all of them make me cringe through their scripted comments- "This will get you that bikini bottom in no time!"- but not enough to reduce my rating. And finally, I've got to say, if these instructors have flabby thighs (?!?), I'm not sure who has thin ones.
Recommended for high-beginners through high-intermediates.