In a bleak attic in Munich, a German boxer is pounding the bags. His name is Jürgen "The Rock" Hartenstein. Once a champion, he is now aging and alone. The boxer eschews women, alcohol and any creature comforts, earning his meager living as a pub bouncer. With no manager standing behind him, he is forced to train in city parks and in a dark, seedy attic with his Afric...