Hi Anna,
Unlike many on these forums, MIC is one of my favorites. But, then, I am a cardio nut - avoiding weights at all costs - well, at least trying to!
Anyway, when I first did MIC, I kept all my movements at a lower level in order to keep up with Cathe. My step was, and still is, at 6 inches. As my strength (in spite of my reluctance) has improved as well as my endurance, this tape gets more enjoyable. The best part is the last interval blast. I whoop it up, with a little help from endorphins...
So, start by just saying to yourself you want to make it through, then build up the intensity later. On the first part there is lo, med, then high impact - so save some energy at the beginning. When you move to the step, stay lo even as she pumps it up a little. You'll get there!!
Joanna