my stomach muscles aren't 100% back to normal 5 years on from my c/s. no matter how many sit-ups i do, sometimes the muscles just dont rejoin if that makes sense!
after your op. do not try to do any form of exercise, rest until you feel able to start being a little bit more active. the area will hurt for a while so let time go and work on yourself when appropriate/ after all it ain't no biggie when your darling child is in your arms.