Rebuilding ab muscles after three kids

hshotty83

I was wondering if anyone had some good strengthening exercises for the abs. I have had three kids they are now 6, 4, and 2 and they were all c sections. My stomach is actually pretty flat but I have no strength to do most of the exercises I have seen to do to help strengthen it. I am so frustrated by this and my husband has tried to help but his opinion is my stomach is damaged beyond repair. I didn't even realize how bad it was until my 6 year old wanted me to show her how to do a bridge and I realized I couldn't lift my core off the ground. Any help would be greatly appreciated.