We've already seen setups that allow stand-up paddleboards (SUPs) to be rowed, sailed, or paddled like a kayak. There's apparently still room for innovation, however – the Supski system lets you propel your board using upper body techniques borrowed from the sport of cross-country skiing.
The Supski is designed to be installed on an existing board, and reportedly should work with standard modular paddles. As can be seen in the video below, users can push back with both "poles" at once or alternate between them – just like they'd do when skiing.
Of course, unlike skiing, it doesn't give your lower body much of a workout. For that, you'd want the PeleBoard striding SUP.
The Supski was announced this month at the Surf Expo in Orlando, Florida. There's currently no word on pricing or availability.