The less vertical displacement the better. You have to remember that vertical displacement happens in to directions upwards and downwards. The more vertical displacement you can actually see the slower the sprinter. Think about this every stride has an apex and a nadir(low point) The higher you are off the ground the more extended you legs will be at ground contact. Unfortunately we can’t resist gravity which causes us to collapse, but the better we are at keeping the body from collapsing the less downward vertical displacement. So to sum it up faster sprinters have great upward displacement but most importantly the have less down ward displacement which is why the hips/head stays at the same plain. Get the hips up and stay up instead of collapsing and bouncing up and down 🙂
