back of the board for your approach and front for the jump
yes but you will not get as far
step over the white board you jump of from.
When you either step past where your not supposed to or you don't jump close enough to the board
The long jump is measured from the front of the jump board to the closes point in the sand that the jumper touches the sand in a straight line.
When you go past the board with your feet.
5 metres exact
When you go past the board by a lot or a little