system
Given the following post, respond as if you're commenting on Reddit:
human
Why is Fosbury-flop the most efficient way to do high jump ?

While doing some research about it I saw that it allows the jumper to keep his center of mass below the bar. But in pole vault they also keep their center of mass below the bar but with their body facing the bar. 

If one approach is more efficient than the other to keep its center of mass below the bar, why does high jumper don't adopt the technique of pole vaulter (or vice versa) ?
gpt
Both techniques use the same principle.

Basically you just draw an arch over the bar. The high jumper touches the floor with his feet on one side so his head will go over the bar and land on the other side. The pole vault guy touches the floor with the pole, which he touches with his arms. So basically he touches the floor with his arms, so his feet go over the bar and land on the mat.

And because the body does this arch, the center of mass doesn't have to be above the bar.