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There is nothing unique about abdominal muscles as far as their training and response to training is concerned. The principles that apply to biceps and triceps apply equally to abs. So the three critical elements of your ab workouts are:
1- High-intensity of muscular overload
2- Progressive intensity from workout to workout
3- Proper spacing of workouts to avoid overtraining or undertraining
Most people do sit-ups or crunches as an ab exercise. While these are basically good exercises that can satisfy point 1 above, how many people use them in a way that satisfies point 2? Muscles will only develop in response to overload that is above normal. So if you do 20 crunches every day for a year, why would your ab muscles develop beyond that capacity? They won't.
To force new development, you need to increase the intensity. You could add a few crunches every day, but that really just increases duration; there is a better way to get fast results.
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