My husband and I call Keli Roberts "the abdominatrix" because I used to weep at the difficulty of Level 4. I would only do one level each day. I quickly improved, my midsection looks _great_, and I can even do Level 4 without cursing. I combine it with aerobic workouts. It's the best ab workout I have: it's not boring, and it certainly isn't ugly, like those hideous Abs of Steel videos. I only wish it were available on DVD. It would let beginners work out to the lower levels first. Of course, you can do the whole workout at once (levels one through four), but then you're a real masochist.