Long jump
Rules

At the elite level, competitors run down a runway (usually coated with the same rubberized surface as running tracks, crumb rubber or vulcanized rubber, known generally as an all-weather track) and jump as far as they can from a wooden or synthetic board, 20 centimetres or 8 inches wide, that is built flush with the runway, into a pit filled with soft damp sand. If the competitor starts the leap with any part of the foot past the foul line, the jump is declared a foul and no distance is recorded. To detect this occurrence, a layer of plasticine is placed at a 90° angle immediately after the board. An official (similar to a referee) will also watch the jump and make the determination. In recent times, laser sensors and high-speed cameras have replaced the plasticine at elite competitions (like Diamond League meetings). The competitor can initiate the jump from any point behind the foul line; however, the distance measured will always be perpendicular to the foul line to the nearest break in the sand caused by any part of the body or uniform. Therefore, it is in the best interest of the competitor to get as close to the foul line as possible. Competitors are allowed to place two marks along the side of the runway in order to assist them to jump accurately. At a lesser meet and facilities, the plasticine will likely not exist, the runway might be a different surface or jumpers may initiate their jump from a painted or taped mark on the runway. At a smaller meet, the number of attempts might also be limited to four or three.

Each competitor has a set number of attempts. That would normally be three trials, with three additional jumps being awarded to the best eight or nine (depending on the number of lanes on the track at that facility, so the event is equatable to track events) competitors. All valid attempts will be recorded but only the best mark counts towards the results. The competitor with the longest valid jump (from either the trial or final rounds) is declared the winner at the end of competition. In the event of an exact tie, then comparing the next best jumps of the tied competitors will be used to determine place. In a large, multi-day elite competition (like the Olympics or World Championships), a qualification is held in order to select at least 12 finalists. Ties and automatic qualifying distances are potential factors. In the final, a set of trial round jumps will be held, with the best eight performers advancing to the final rounds. (For specific rules and regulations in United States Track & Field see Rule 185)

For record purposes, the maximum accepted wind assistance is two metres per second (4.5 mph).
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