Quarterback (originally called blocking back) 's a position in American and Canadian football. Quarterbacks are members of the offensive team and line up directly behind the center, in the middle of the offensive line. Quarterbacks are the leaders of the offensive team, responsible for calling the play in the huddle. They initiate almost all plays by receiving the ball from the center, although occasionally teams will use a 'direct snap' (usually as a trick play) to another offensive player. On… (More on Quarterback)