I did Kick, Punch, and Crunch for the first time today and I'll be very surprised if I'm not sore tomorrow or by the end of today. My legs are hurting as I sit here typing this. This workout is so different from Cardio Kicks. It can be done totally low impact which is what I pretty much did and I still had to take breaks. That last section before the drills just about did me in. It is the one with the hammer punch and pull the knee in. I wish I had my heart rate monitor on because there is no telling how high my heart rate went. I had to stop the tape and walk around before I could move on. And then I didn't even do the very last drill with all the kicking. My legs were just too tired. The ab work is wonderful. I loved where you move the ball to your feet and back to your hands. I was really getting sore in the abs and almost had to stop. I will definitely be doing this workout at least once per week as I need it.