My vote is for another series like CTX with 3-4 30-minute cardio workouts. I just have such a tight schedule that those 60+ minute workouts don't always work into my schedule and I get stressed out because I don't feel like I get a complete workout unless I do the whole thing. A 30-40 minute workout would be perfect...I'd feel like I got a great workout and didn't have to sacrifice dinner time, time with my husband, and my homework (I'm one of those adults who has returned to school and still have a full time job) to get it.