What causes the bulge in between my muscles while I do sit-ups since my pregnancy?

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The bulge is most likely due to a separation (diastase recti) of the muscles of the abdomen, the rectus abdominus muscles. The separation occurs from tissue relaxation caused by hormones to make room in the abdomen for the pregnancy. The tummy tuck part of a Mommy Makeover repairs the diastasis and tightens the muscle wall to eliminate the bulge. The tummy tuck (abdominoplasty with muscle repair) makes sit-ups and abdominal exercises more effective by tightening and bringing the muscles into better alignment in the front of the tummy.