Myth #1: You need to work your abs everyday.
Truth: The best way to develop abdominal strength and tone is to work your abdominal muscles to exhaustion.
You need to allow your abdominal muscles to recover…
This equates to 24-48 hours of rest time between workouts.
Increase the intensity of your workouts gradually .
If you overdo it, not only will you be excessively sore (a little soreness is a good thing, it signifies that you have worked the muscle enough for it to repair itself and become stronger in the process), but you may discourage yourself because you will need more rest time than normal and it will be harder to do your ab exercises.