I've been working out with a trainer for a month now. When I came in today, she laughed, clapped her hands and said today is going to be fun. When your trainer sounds like the wicked witch of the west (I mean that very affectionately Jerri) RUN. But no. I went through it. We did things to my abs I didn't know was possible. Angled crunches, regular crunches, supermans, all my arm weights on the bosu stability bubble. May I say OUCH! I knew my abs were going to hurt later. I did not know it would hurt when I breathed.