Different varieties of crunches can effectively hit any portion of your abs. Sit-ups only hit the abs for a portion of their range of motion. For the most part they work muscles in your hips and to some degree your lower back.
An ab routine that I enjoy(as much as I can enjoy such a thing), is a superset composed of-
Crunches, 2 sets, 15 reps each
Reverse crunches, 2 sets, 15 reps each
Crossover crunches, 2 sets, 15 reps each
That should hit pretty much everything. Just be sure to keep your reps slow and controlled. Good form will do more for you than anything else when it comes to abs.
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