Straighten the waist when the navel area of the pulling pain, should be the rectus abdominis muscle is pulled caused by the pull, may also be the navel around the skin tissue is pulled caused by this phenomenon is actually not a disease, generally with a long time not exercise exercise, so to improve this situation, you should participate in some sports exercise, especially do some stretching movements, more helpful to improve the symptoms. There is also a special case, if the pain occurs after doing sit-ups, then after a period of rest can be relieved.