when ever i do crunches, or any kind of situp like routine. after about 3 or 4 crunches my back feels like it is 'burning'. it is not hot, it feels like my muscles are pulling all wrong. when i bench, use cords, or do squats, it does not burn. It only burns when i am having to bend up with my abs or back. I need help. i am doing the correct form by the way.
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