I must be doing it wrong. I do it at home, though I may switch to an incline bench at the gym. I definetly feel it, but am not extreamly sore.

I think there's either one of two things happening. Either the pilates has given me nice ab strength so I can keep up, or my form is way off. I plan to hit the gym tomarrow for cardio instead of trying to run, and will do the ab bootcamp there. I think I'll reread the web page and double check my form on all the exercises.