What it is
The board is a rigid strip, 20 centimeters (8 inches) wide, set flush with the runway surface so your foot doesn't feel it underfoot. In the long jump it sits close enough to the pit to contain even the longest legal jumps; in the triple jump it's set much farther back, since the hop, step, and jump together cover far more distance than a single takeoff. The front edge of the board, not the board itself, is the actual foul line every jump gets measured against.

