In the NBA, a swingman was usually a player who could play a variety of roles under the basket. He could play the role of shooting guard, small forward, or power forward. Such players usually had excellent basketball intelligence and physical fitness, which could play a multi-dimensional role in the game. The sweeper in football usually referred to a defensive player whose main duty was to guard the goal and prevent the opponent from scoring. The sweeper needed to have excellent defensive skills and physical fitness to be able to maintain balance in the defensive position and be ready to deal with the opponent's offensive threat at all times. A free agent usually refers to a football defender whose main duty is to guard the opposing striker and limit his scoring. Free agents needed to have excellent defensive skills and physical fitness to play an important role in the game, especially when the opponent took a quick attack.