Hi all, I recently increased the daily upright bass training to 3 X 45 minutes sessions with 15 minutes pause in between. After one month I am feeling some left chest pain, expecially when I am tired (and shoulder blade pain from time to time). I also noticed that my left breast muscle is bigger than the right one and my left pinky muscle is also a bit bigger. I was wondering if the chest pain and muscle asimmetry are common for the double bass. I am 33, I don't think it is something heart-related... but it may be a stress effect. Let me know if you had some similar experience. best!