Because there are no limits! Enter Robbie 'Maddo' Maddison's pipe dream. It's a biker's dream to ride the waves. It's probably the best expression of freedom we've seen in a long time. There's no point in talking further. Just watch.
If you watched it and you're looking for further info, Robbie is a professional stunt rider. The action was filmed in Tahiti, and... it took around two years of training for this. The waves come courtesy of Teahupoo and Papara.