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The Innespace Dolphin was inspired by the streamlined and hydrodynamic design of dolphins. It is able to rocket across the waves at high speeds, performing stunts and maneuvers much like a real dolphin. Its fins cause negative lift, allowing it to dip underwater for short periods of time, and leap back out of the waves and into the air. It can also do barrel rolls with relative ease while maintaining forward momentum.

This looks like so much fun. I wonder if these will replace jet skis someday. 

I think that this is really cool but what kind of practical application does it have. I guess its not really meant to have practical application and that its just meant to be some really cool water toy. I can't image that people would have those in the future instead of driving a jet ski you would have a Innespace Dolphin machine.