with my last baby (now over 2.5yo) i developed diastasis rectus (split abdominal muscles) and kept meaning to get around to 'fixing' them with a certain kind of crunch. now that i'm pg again, i'm actually starting to do these crunches every day and feel a difference already these past 2 weeks. I read on the web that you can do the exercises up till 4 months. Anyone have experience with this? The thought of a pendulous abdomen 6 months from now and achy back really has me motivated for now. anyone doing this too?