For the most part:
Crunches work the upper abdominals. The two top nubs below your pectorals get the most work from these short strokes.
Leg raises work the middle abdominals. I do a lot of these. Helped strengthen my core extensively. It also is the way to get that silly ravioli ab status symbol if you're a guy. I ended up with it indirectly.
The lower abs? Them bastards require hanging and knee / leg lifts, which I hate.
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