Yes, you should exercise. But you have to be careful not to overdo it. And, most importantly, pregnancy is not the time to be focusing on your ab muscles. Those are the ones that can develop the problem during pregnancy and postpartum, and working them too hard with a big, round belly increases the chances of that separation occurring--and the pooch that goes along with it. Of course, a strong core is beneficial for the process of labor and birth, but you can keep those muscles strong without crunches or planks. Focus on keeping your tummy tight while doing other exercises and your core will stay strong.
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