In
American football and
Canadian football, a
lineman is a player who specializes in play at the
line of scrimmage. The linemen of the team currently in possession of the ball are the
offensive line, while linemen on the opposing team are the
defensive line. A number of NFL rules specifically address restrictions and requirements for the offensive line. The defensive line is covered by the same rules that apply to all defensive players. Linemen are usually the largest players on the field in both height and weight, since their positions usually require less running and more strength than
skill positions.