The cup involves three players, arranged in a semi-circular cup-shaped formation, one in the middle and back, the other two on the sides and forward. One of the side players marks the handler with a force, while the other two guard the open side. Therefore, the handler will normally have to throw into the cup, allowing the defenders to more easily make blocks. With a cup, usually the center cup blocks the up-field lane to cutters, while the side cup blocks the cross-field swing pass to other handlers. The center cup usually also has the responsibility to call out which of the two sides should mark the thrower, usually the defender closest to the sideline of the field. The idea of the cup is to force the offense into making many short passes behind and around the cup. The cup (except the marker) must also remember to stay 3 meters or more away from the offensive player with the disc. The only time a player in the cups can come within 3 meters of the player with the disc is when another offensive player comes within 3 meters of the person with the disc, also known as "crashing the cup".