This extreme sport is called ...
Flyboard 
Wakeskating
Wakeboarding
Kitesurf 
Wakeskating is a water sport and an adaptation of wakeboarding that employs a similar design of board manufactured from maple or fibreglass. Unlike wakeboarding, the rider is not bound to the board in any way, similar to the skateboard, from which the name derives.
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Flyboard 
Wakeskating
Wakeboarding
Kitesurf 
answers
 Australia
Australia13
 the United States
the United States39
 Greece
Greece10
 Poland
Poland1229
 Estonia
Estonia10
 Germany
Germany59
 Austria
Austria24
 the United Kingdom
the United Kingdom30
 Republic of Ireland
Republic of Ireland11