Sandra: thanks for pointing that out! I never understand why people beat themselves up trying to do MIC without stopping like it's the ultimate challenge and they have to conquer it. Cathe does not even go straight through herself!
Cut yourself a break, and if you must do MIC all the way through, build up to it slowly. Go all out on the first section as your cardio for the day. Stop, get a drink of juice and sip it slowly. Then, start the second section at a much lighter intensity, with lowered step, telling yourself you are just going to get a feel for the moves. See how much you want to do as you learn the choreography. Maybe you'll end up doing it all, maybe you'll quit after 10 minutes. Either way, you will have conquered the challenge you set for yourself that day and that is just fine.
Personally, I only ever do the first section of this workout. I use it as a warm up for weight training. It's the perfect length for that. I never do the step section ever because in comparison to Step blast, Powermax, etc, this is a rather uninspired piece of step choreography I find and the music does nothing to motivate me.
If you insisted on a long cardio session, you may find it more interesting to tack together 2 of the CTX cardios. Certainly, this would help with cross training........ this is a way more interesting way to go IMHO.
Clare