There are more than one type of "sore" shoulder or any joint for that matter. I loaded trucks and worked for a landscaper when I was in my teens and nearly every joint and muscle in my body was sore, sometimes all at once. Forty years later, I still do a lot of physical labor and frequently I still have sore joints and muscles, so what, would I hve been better off, sitting on the couch and watching TV? Much of the time the physical problems develop from simply overdoing it with one part of the body and lots of people never do anything physical in their lives so they have no idea what normal soreness is. I frequently draw my bow with my offside(left arm for me) and hold for a few seconds at full draw, this helps equalize the muscle development and prevent some problems. Also remember that the word these days is crosstraining, any exercise benefits the entire body and even running or walking will cause arm and back muscles to get bigger, without putting any stress on the joints. The latest studies have shown that people that live and active life actually have LESS joint pain in later years than the inactive ones. The idea is just not to do any damage, don't try to yank a bow back that you can't draw normally OR shoot to much, if you get tired put the bow down, shooting when you are tired just promotes bad habits and overuse injuries. Its much better to just shoot a few shots more often then a lot of shots at one time.