Bruce- he was WAYYYY ahead of his time in his training and his philosophy. He was the first mixed martial artist!
As far as workouts, I'd say bent over bows (preferrably 1 arm dumbells) focusing on using your back muscles to pull. Also, if your gym has a pully machine that allows you to adjust the height of the pulley, set it at about chest level, and pull it towards you just like you pull a bow. When I was rehabbing my shoulder from a torn labrum, I did this to get my "bow" strength back, and it worked wonders!