If a Quad and Jetski had a baby, it would be the Quadski. You're probably gonna be the talk of the town with this crazy yet awesome ATV/Jetski hybrid. The Quadski is an amphibious 4-wheeler that can go fast (up to 45mph) on both land and water and transitions almost instantly; inside is a BMW engine, which might have something to do with it. Nothing before it has ever even reached 10mph on water. With this monster around, you don't need motivation to stay active, you just go out there and have fun.