Our expert says:
More reps helps a little with toning and definition, which it sounds like you need. Also, if you do a lot of quite static exercise you don't see the same kind of definition as more dynamic exercise provides. This is why elite athletes develop such ripped abs - they first of all have little body fat, and second, they do a lot of functional work. Sit-ups are all good and well, but things like medicine ball throws and catches, rotations etc help a lot.
I also think you may need more cardio work, particularly to burn fat. The flat six pack requires fat loss, and that requires cardio, so I think you can shift the balance that way.
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