Abs is 90% diet. Stick with crunches and and some core exercises and as long as you're diet it good, they'll come.
I always used the exercise ball. Feet flat on the floor with toes against the wall (for stability) and knock out a few sets. On top of that, try just leaving your heels on the ground (toes of the floor/wall) for added involvement of the supporting muscles. That ones a bit of a balancing act. But that's what makes it good!
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