Football players are an integral part of the game. LINEMEN, also known as offensive LINEMEN, are the players who line up on the line of scrimmage and block for the quarterback and running backs. They are typically the largest players on the field and are usually the strongest and most experienced. ENDS are the players who line up at the end of the line of scrimmage and are responsible for catching passes and blocking for the quarterback. Linebackers are defensive players who line up behind the line of scrimmage and are responsible for tackling the ball carrier and defending against the pass. All three positions are essential to the success of a football team.