What are the rules of the long jump?

Take off from the board without touching the ground beyond the take-off line. The jump is measured from that line to the nearest mark in the sand made by any part of the body. The best valid jump wins.

What makes a foul

A jump is a foul (X) if the athlete:

touches the ground beyond the take-off line while taking off;
takes off from outside either end of the board;
walks back through the sand after landing, or first touches outside the pit closer to the board than the nearest mark;
uses any form of somersault.

Board, wind and attempts

The take-off line sits 1 to 3 metres from the near end of the pit. Wind is measured for 5 seconds from when the athlete passes a mark 40 metres from the line, and over +2.0 m/s the jump is wind-aided. Athletes get three attempts, and the best eight get three more.