Granite....
The problem with most shoulder injuries is.....you hardly ever know, exactly, when your injury occurred.
I played baseball, through college, as a catcher. I played my last baseball game in 1986. I had rotator cuff surgery in 1999. Reckon when I hurt it, though?
The worst my back ever went out......occurred while I was brushing my teeth. I don't suppose my scrubbing caused that, either.
I'm not saying heavy poundage bows WILL cause injuries. I'm just saying they could be..........slowly.
NO kick on heavy bows. If I thought I needed to shoot a heavier poundage bow, I'd work into it. Kudos if you need it and can pull it off (without hurting yourself).
Good luck to ya.