Yesterday was my "rest" day from working out. So naturally I couldn't just sit out a day, I tried to learn IMAX. Well, what a shock. I could only make it through the first 25 minutes! Cathe says in the beginning of the tape that you'll have to "work-up" to this tape. "As you find you can go longer and longer, you'll get stronger and stronger." Well, I'll definately have to work up to this one. That's my goal for the month of October ... to compleme IMAX with no modifications! I considered myself to be a relatively seasoned exerciser, I run, use Cathe, Fitprime, CIA Bootcamp and the Firm -- but nothing compares to this as far as a cardio workout! I'm gonna try it again, but this time I'll lower my step height. Wish me luck!