Hi, Nancy, 4DS has 4 work outs. Each one is 30 minutes of cardio and 30 minutes of weights. It would be very easy to do the weight segments alone. For a 4 day split, just do the 30 minutes of weights from each work out. It will be split like this:
1. Legs
2. Chest and Back
3. Shoulders and Calves
4. Biceps and Triceps
Obviously, you can do them in any order you prefer. Or if you want a 3 day split, you could add the calf work to the leg day and the shoulder work to either of the other two days. I've been meaning to do it like that, but I haven't had a chance yet. I'll probably try it next month.
I love 4DS and I think it would make a good addition to your collection. I don't know if you like Cathe cardio, but I agree with the other posters that this is some of her best cardio choreography. I love dancey step, though, and that's what the step work outs in this series are.
Anyway, just get it! Ha! I hope that helps.
anne