Our expert says:
The crunch with the twist, as I understand it, would involve getting the normal crunch movement in but with an oblique movement - try to think of a situp where your right elbow touches your left knee, and vice-versa. That rotation is the twist.
As for others, is your objective to create definition in the abs? A big of that, remember, is that you must also reduce body fat and therefore do cardiovascular training. You could do a thousand situps a day and make little impact at all, unless you also do the cardio. So perhaps that's what you need to address, more than another exercise?
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