In doing sit-ups if there is back pain, mainly due to two reasons: First, in the process of doing sit-ups lead to excessive stretching of the back muscles, fascia, ligaments, thus causing stretching, edema, will lead to significant soreness and pain in the back, especially in the bending activities or do sit-ups in the process of pain is particularly obvious. Second, see in the back of the bone degeneration, hyperplasia, this situation is mainly caused by excessive stress on the back in the early stage, so the process of sit-ups will cause hyperplastic bone stimulation of the surrounding soft tissue, thus causing soft tissue edema, causing obvious back pain symptoms.