It's obvious it's fake :
- impossible to calculate a precise point of "impact" with such an imprecise starting and jumping ramp
- I doubt it possible to calculate precisely the friction coefficient of "a man sliding on a wet ramp that we made wet ourselves randomly", especially if the water falls and therefore don't stay on an inclinated ramp
- impossible to stop a mass with such a velocity in so little water. You couldn't even fall in it from the height of a man. Really, is it possible when you live since 20 years on earth to physically feel possible such a reception ?

- impossible to be sure the man is in the exact right direction (no system of direction on the video), and no way to stop if he is not
- and even, impossible to be sure the man is gonna enter the water the good way (if he doesn't enter it "vertically" you can start finding the pieces of meat)
It would be possible on a bigger pool with a good calculus of margins applied, but to be sure, it would be a BIG pool, and there would stay the problem of reception in water !
Anyway it's really well faked, technically speaking !
If you want a really impressive video, this one is cool :
PS : it's not fake and that's what is quite tremendous in this one
