As the leader of the team, the quarterback is the only player to always get the ball. As quarterback, he has the choice between running the ball and throwing the ball. The quarterback is also the play caller, whether it is in the huddle or changing the play at the line. He is the most important player on a football team without a quarterback the team cannot play. The quarterback can hand off the ball to the running backs and fullbacks, throw the ball to a wide receiver, or can run the ball himself. The number of a quarterback is between 1 and 19.