7 July 2013 Last updated at 10:48 BST
They have been showing off their best tricks on the water in a big wakeboarding competition in the US.
The brave contestants are pulled behind a speed boat on a board and they use the waves made by the boat to perform amazing jumps and stunts.
Some of the moves are so quick you have to watch them in slow motion!
The best wave riders on the planet have been twisting their boards 20 feet in the air!