Maybe this works, but each time you use a lot of these exercises, you put your spinal cord at risk. Crunches are disk crunchers. Shouldnt even be doing them. The core is meant for stability, not flexibility. Sure, you can get nice abs from these work outs, but you can cause incorrect firing patterns to happen within your body which can cause other muscles to compensate.
Listerine0000 about Ab Workouts App