I've had 3 c-sections, and since the first, have been unable to do a situp. not in a 'wow, this is way too hard, and it hurts' way, but in a 'unable to fly either' kind of way. I can do a crunch, and leg lifts, which suggests that my abs are really there somewhere under the extra 30lbs, and I can do leg lifts well, and for a long time, and can do all the ab machine stuff at the gym that isn't actual sit ups. if I try to do a situp, i just stop moving after the crunch part, no matter what I do (unless I cheat and push up with my elbows or grab my legs and pull) i will not move. trying a situp in reverse (a sit down?) i run into the same thing, about halfway down, i just start falling, unless I grab my legs or support from the floor. like a nerve issue? any thoughts? if i can't figure it out, I'm going to have to go to the doctor, no, it's not life or death (8 + years since my first c-section), but it is annoying.