There is this lady at my gym that is going to be in some sort of miss fitness contest and I heard her talking to someone about her AB routine. She said she was doing 500-600 sit-ups/crunches every day. When I asked her about recovery time for her muscles, she said every muscle needs time to recover....EXCEPT ABS. I was like ok. Then went back to lifting. what in the hell makes abs different than any other muscle?