In Pilates: Pick Up Artist :: Abs exercises - Back pain

Pick Up Artist :: Abs exercises - Back pain Whenever I do exercises that isolate my abs (crunches, sit-ups, leg raises, etc), basically any abs exercises I do lying down, I'm forced to stop, not because of my abs, but because of my back. My back starts to hurt, and not in a good way, and I usually tap out because I don't want to risk serious injury. I'm fairly certain it's my posture while I'm on ...Pilates