Apologies for not answering exactly the question you asked, but I always try to talk people out of doing "ab workouts". Building up one particular muscle group and not its antagonists and helpers is a surefire way to develop posture problems and ultimately back injuries. That's what doing lots of ab work in isolation will get you. I know the term "core" is trendy now, but nevertheless, it's the right concept -- build all the muscles in the trunk, and you'll look better, feel better, and achieve what you want.
The first line of attack here is to do exercises that require you to brace the trunk -- squats, deads, snatches, etc. Next line of attack is to hit the core from every angle, using exercises that do much less isolating than crunches do. Kneeling ab wheel rollouts, L-sits, chinnies, russian twists, good mornings, supermans, etc., should be the staple exercises in your core workouts -- not crunches.
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