I got back into poling 6 months post birth. I agree with the core stuff. It takes time to rebuild properly. You must wait for your abdominal separation to repair before doing crunch type activities. Your abs separate to give you the baby bump. If you don’t wait you will make the separation worse. YouTube “exercises for diastasis recti” or abdominal separation and do those before you partake in your traditional core exercises. I’ve had 2 kids and am now 16 months post birth of the second and my core has never been better.