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Anonymous
Leg raises and sit ups primarily work the hips. Leg lifts put huge shear loads on the spine. Check out Dr. McGill's spine books if you're interested in safe, high performance core training. Short version: skip any core exercise that involves loading the spine with long levers, or movement of the lumbar spine. BUt, you won't listen, so have fun fucking yourself up.
BTW, I know all this because my spine is fucked.
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