A running back is a key player in American football, primarily responsible for carrying the ball during plays. They line up behind the quarterback and can run with the ball, catch passes, or block for other players. Their speed and agility allow them to navigate through defenders and gain yards for their team. In addition to running, running backs often play a crucial role in the team's overall strategy. They can help control the game's tempo and are essential in both rushing and passing plays. Famous running backs like Walter Payton and Barry Sanders have left a lasting impact on the sport with their incredible skills.