If you’re doing crunches, but not seeing results: It’s because you’re only doing frontal crunches (i.e. the “normal” kind), which only stretch one area of your abs. You need to stretch your sides as well: do crunches to the left, and to the right. If you’re doing 200, divide it up: 50 frontal, 50 left, 50 right, 50 frontal again.

Doing a “left” or “right” crunch means this:

• Assume the normal crunch position.
• Push your knees to the left for “left” crunch/to the right for “right” crunch. Your legs should be tilting towards the ground at a 45 degree angle.
• “Crunch” like a regular crunch: keep your core facing forward despite the turned legs. Do not pull your stomach up towards your knees: pull forward just as you would a normal crunch.