how is the long jump measured?

Measured in metres, from the line edge of the line where they take off (not the foot) to the furthest back point. So if you put your hands back when you land, it will be measured from the tip of your fingers. Hope this helps :)

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They rake the sand flat after every jump and then mark from the first indentation the jump makes. So if you jump and fall right back you'll ruin your distance, it's why the jumpers try to land and fall sideways or spring forwards.