Tough!
Yep, IntervalMax is a tough one. I bought it recently, but haven't tried it since I borrowed a copy from a friend this past spring. This is one video I'll definitely need to "work up to."
I don't remember which thread, but not too long ago I read a post from Cathe where she suggested easing into IntervalMax by doing only the first 5 intervals at moderate intensity, then working up to full intensity with the first 5. Once you've mastered the first 5, I think she suggested adding the remaining intervals in gradually, one at a time, then upping the intensity until you can do all 10 at full intensity with modifications as needed. (Cathe, please correct me if I misinterpreted any of this!)
Have fun with the video!
Lynne