If you really want to concentrate on muscle building, I'd go for the GS workouts, PUB/PLB, and S&H for splits; and MM and MIS for total body. I don't know what you already have but those would be first choices for strength training and no cardio. BM is the first workout I may reach for after a lengthy vacation or after a few days of rest and I've got pent up energy. It's great for those days when you've got tons of energy and want to get it all (cardio & weight training). You don't get a full hour of each but you get it all! But you can always mix it up with other workouts (as I'm experimenting with now) and it's a good addition to a fat loss rotation. Plus this dvd has Power Hour and MIS, two great total body workouts to add to your collection, so you can't really go wrong with this purchase, in my opinion. I'm looking forward to Body Max 2. Much like on the first, I expect Cathe will really make us work hard on that one!