Speed at the board sets the distance
Elite men arrive at the board around 10.5 m/s and convert a fraction of that horizontal speed into lift. That is why the world's best long jumpers are almost always among the world's better sprinters, and why a jumper cannot technique their way past a slow approach. Everything after takeoff protects distance rather than creating it. Ordinary adults are nowhere near those approach speeds, as how fast the average person runs 100m makes clear.

