I'm doing the 90 day rotation (have another two weeks to finish) and have loved all of the workouts. The Total Body workouts were great because they got the HR up a bit more. I also really liked both Upper and Lower Body workouts, as well. Into the rotation, I also enjoyed the Individual Body Parts but thought I would not like them, as much. If you have a certain area you want to give special attention to, they're also great! I purchased Dip Bars for this rotation and have been able to use them during the Back & Triceps workouts, increasing the challenge. Cathe may use these in another (Upper Body?), but I'm forgetting now. I will say that in a 12 week rotation, the parts workouts get to be a bit much, so I've slowed the frequency down when they come up on the schedule now doing at least three per week. I followed the rotation, as specified (to a T) until about halfway into, always doing the full workouts. I began adding more yoga (other than Cathe's) but did like what she'd also created with regard to mobility, stretching, recovery workouts. I just recently did one of the body part premixes (shortening the workout) only because I was going on very little sleep that day. Overall a fabulous program...and I'm seeing results! Stronger than when I began, and more definition and muscle where there was none before! Everything is toned and tightened. A big win for the investment in time!