MIC has GOT to be Cathe's hardest of all time workouts for me. I just did it this morning and am still recovering. Matter of fact, I had finished the Hi/Lo section and started the step section when I got a case of "crankiness"! Those forbidden thoughts came to me -- why did Cathe have to combine one of her hardest floor workouts with one of her hardest step?
This and Interval Max (another killer workout) are the tapes I have to "pysche" myself up for. That said, I'd say that both are worth every penny and every second of my precious workout time. And it doesn't matter how many times I've done them, I still feel like I've REALLY done something stupendous and I'm always pretty proud of myself after finishing them.
So, if you want challenging workouts, MIC and Interval Max are the way to go.
If you want cardio plus weights, Body Max, is very challenging as well.
Whatever you choose, Cathe is the best!
Patricia