I've been using the stationary bike and the ellipitical for years, sometimes up to an hour every day. In addition, a few years ago, I had a strict routine of 200 stomach exercise every single day. As a result of these rigorous and continous work-outs, my upper back has suffered. My shoulder blade muscles are buldging, the muscles along that area are incredibly sore and I even have some tingling and numbness b/w the shoulder blades. My physio therapist suggested that I strengthen the back muscles below the shoulder blades so that the ones above are not working over-time. Any suggestions as to how I might do this? I don't know much about weight-lifeting, but are there any specific exercises that I can do to strengthen my mid-back? Thank you in advance.