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Anonymous
Get close to a wall. Put your legs up and plant your feet on the wall. Your knees should be bent at a 90 degree angle.
Lay flat on your back. Extend your arms at your side, palms down, so they're near your butt.
Suck in your gut and crunch upwards, focusing on the upper abs. Don't rock your shoulders and keep your head/neck stationary.
Try doing them like this. You range of motion is pretty low, if you start to feel it in your back, you're going to high.
I had a sore back for a few weeks and doing crunches like this actually helped it.
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