5 metres exact
Runners run down a runway to a board 20 cm wide they must jump from without the planting foot crossing the plane of the board(forward) and land in a sand pit. From the forward edge of the board to the place nearest where the runner landed in the sand pit is the jump distance measured in meters. In the USA this measurement is in meters and/or feet.
The long jump boards are the white lines that line the run way of the pit. These lines are certain lengths away from the edge of the pit. For outdoor the distances from the board to the pit are 4' 8' & 12' in indoor the distances away from the board are 5' & 10'
The pit.
just that: the sand pit.
From the end of the takeoff board to the point in the pit closest to the board where the jumper touches the sand. If a jumper falls back with their hands, that is the point at which the jump is measured.
a sand pit
it is soft
A legal jump is one that counts, i.e. the jump is measured and goes towards the athlete's result. An "illegal" jump would be one where a foul is committed. This includes, taking off in front of the take-off board, landing outside the pit, walking out of the front of the pit or taking longer than the allotted time.
On average the Olympic pit is 24.75m2 on the top.
a stretch with a sand pit a at the end
300 thousand metres
13-17in