Now this is a sport we'd love to see in the Olympics.
YouTube film-maker Devin Graham opened our eyes to this astounding concept in an epic video, shot in stunning 4K video.
Stars of the clip run down a massive hill in Rotorua, New Zealand, trying to escape from a giant Zorb ball filled with other people and some water.
Luckily for them, the inflatable Zorb is too light and soft to do any damage, unlike the boulder Harrison Ford outruns in 'Indiana Jones: Raiders Of The Lost Ark'.
That would certainly do some damage. And it might not be quite as much fun as the Zorb version.