No-Equipment Ab Exercises Chart - Bodyweight exercises always recruit more than one muscle group for each exercise so it is impossible to isolate and work one muscle group specifically by doing one type of exercise. It is however possible to increase the load targeting specific muscle groups with specific exercises so that they respond the most to the challenge. The following chart helps you find the exercise that helps focus more on specific abdominal muscle groups for best results.
This is one of the best articles I've read about the topic. I didn't realize I had DR until about 8-9 months after baby was born. I should have been tipped off when I threw my back out and had significant weakness in my core. I stopped doing abs at all because I was afraid, but as soon as I started the RIGHT exercises, I've started healing quicker than I imagined. Check yo' self before you wreck yo' self.
5 Beginner Core Strength Exercises - The best thing about this video is that she's actually doing the exercises correctly. For example, you should not be able to lift your knee very high while doing clam shell and the knee should never lift as high as the hip socket while doing bird dog.