I found the best sit-up replacement ever!
Okay, basically do like I said in the post above, except you place a large (somewhat stiff) pillow under your butt and lower back. Actually, I think a couch cushion might work well.
From there, your body should be at a slight downward angle from the wall, but make sure it's an even angle, your back straight as possible.
Now keep your arms straight out. Do crunches and bring your palms to the wall. Bend your elbows a bit if you need to, but otherwise don't move your arms.
Oh man, you feel the burn really fast, and it puts very little pressure on your back. I could even do these with my back still being a bit sore from sleeping crooked.
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