I've been a weightlifter for quite a few years and I feel that weightlifting should enhance your shooting ability. It goes without saying that your strength will increase, but your endurance at holding at full draw, shooting a lot of arrows, etc. should also improve. Increased muscle size does not diminish your abilities or your bow shooting accuracy. Former Mr Olympia winners Arnold Schwartzeneggar and Frank Zane were buddies who practiced target archery when they were at the height of their bodybuilding careers. It never interferred with their accuracy although Frank Zane said that Arnold often had a red mark on the outside edge of his chest following their practice sessions!