I have recently joined a gym, I am overweight but I have no problem exercising. I go on the treadmill for 40min, then 1 hour of spinning and sometimes another hour of toning. The only problem I get is when I am doing crunches. There is a pain in the middle of my chest, right under my breast bone and it feels like a pulled muscle. I usually have to roll over on my stomache to stretch it out and it feels like it goes back in its place or something. I had my gallbladder removed over a year ago and one of the small incisions is very close to this area. What is it that is hurting me and how can I fix it? Does it have something to do with my surgery from last year?