Gavin Free, co-host of YouTube channel The Slow Mo Guys, filled the soccer ball with water, to make the impact harder. Then he threw it in the face of his partner, Daniel Gruchy.
They had to do some testing, because Daniel had to keep his facial muscles from reacting before the hit. With two attempts was enough.
The video was registered with a camera of last generation, capable of recording 28,000 frames per second. And then, played 1,120 times slower than it actually did.