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Originally Posted by bmulls
It's because you have a heavy upper body. I have the same problem. When your back comes off the floor there's a moment where you are basically see-sawing on your butt. If you are carrying any appreciable amount of muscle your torso is going to weigh more than your legs and you'll fall back.
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That has to have something to do with it besides my somewhat weak abs.
Because I've seen fat out-of-shape women with thunder thighs doing unassisted situps, and I doubt it's because they have strong abs. Their lower body weight helps them stay grounded.