You are lucky to get the quick diagnosis. I had my first bout of PMR when I was 57 and like you was very active, aerobics classes, weights, etc. It actually started the day after I got my a very good time in a 5-mile run/walk. I didn’t get a diagnosis for 2 months because I tried to heal it on my own (unsuccessfully). I was on prednisone for 2 years and then it was in remission for about 12 years. I am 74 now and on my 3rd bout. My first rheumatologist warned my not to lift weights over 2 pounds due to risk of tendenitis. I did have tendinitis twice and had PT to heal it. I also tried acupuncture and had side effects. One acupuncturist told me to avoid acupuncture when one has an autoimmune disease since it helps the immune system and makes the autoimmune disease worse. I don’t know if PMR is autoimmune or not. Be patient in reducing prednisone.