Legs feed the wolf

I was watching "Miracle" last night late into the night. Miracle is the Disney movie about the 1980 USA hockey team that won the Gold in the Olympics. It's a little hokey, but I really like that kind of stuff. The Kurt Russel character, Coach Herb Brooks, is explaining how they're are going to be the best conditioned team on the ice. He makes them do ladders, where the players skate from the goal line to the blue line and back, to the red line and back, to the far blue line and back. Before they begin he says "Legs Feed The Wolf".