Originally Posted by scr
If my head tilts downward in the body upward path, it will dampen the effect of 2nd kick.
Voilą, it's so simple. And this effect can be seen too (among elites).
Second kick / final push gets you to fly (literally) during this critical phase where your arms are recovering. Any tilt down of the head (like we often see) shortens the *fly over* phase.