Link to full storyRiders operate the "Pumpabike" by bouncing up and down on a small platform at the rear of the contraption, whilst holding onto a steering column at the front.
In doing so, they can reach speeds of up to 16 knots (30 kilometres per hour), says inventor Mike Puzey
The only drawback of the device is that its rider needs to kick off from a jetty, a boat or a specially provided stand to get enough forward motion for the hydrofoils to start working. This means if the rider stops bouncing or falls off, the craft lowers into the water and they must swim back to the launch point, towing it in their wake.
Considering that I have negative bouyancy I don't think that I will go for a ride on one of these.