i have not been shooting any bows heavy or otherwise, I hurt my left, my left shoulder yesterday learning Campanas Del Alba. I got it to being it was mostly mezmerized, now today i cannot even play Just goes to show, one can hurt themselves with a light bow as well as a heavy one, if I can do it with a guitar. I never once hurt my shoulders shooting 90 pound bows when I was younger, or it least it did not seem like it at the time, but there must be wear and tear that I was not aware of. Right now I wish that I listened to John Schulz and had never gone over 55 pounds.