IMHO, you cannot continue in traditional archery without physically training for the act of shooting a bow. It is a martial art, the same as boxing, mauy tai, wrestling, etc. No, you dont have to be a powerlifter or fighter, but, you do have to make the effort to keep physically strong and flexible.
if you doubt this, just go over to PowWow and search"shoulder injuries" . train hard, play hard, survive.