The long jump is an event in which athletes combine speed, strength, and agility in an attempt to leap as far from the take-off point as possible.Competitors sprint down a runway and jump as far as they can from behind a foul line, or board, into a pit filled with finely ground gravel or sand. The distance traveled by a jumper is often referred to as the "mark" because it is the distance to the nearest mark made in the sand from the foul line. If the competitor starts the leap with any part of the foot past the foul line, the jump is disqualified and the jump does not count. An official (similar to a referee) will observe the jump and decides if the jump should be counted. The competitor can initiate the jump from any point behind the foul line; however, the distance measured will always be from the foul line. Therefore, it is in the best interest of the competitor to get as close to the foul line as possible.