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sit-ups form: difference between straight back/shoulders back, vs. hunched

there are two ways to do a sit-up: the easy way, which is the way you probably do it and the hard way, which involves maintaining posture of straight back, with shoulders in their proper position ...
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Stomach muscles burn after doing crunches?

I used to be able to do 100+ crunches, but now I can only do 40 and my abs feel like they're burning so badly(after). I don't do crunches often anymore. I lost weight(about 5 pounds) before this ...