This looks like an absolute blast, while getting some exercise in the process.  Imagine running downhill with a giant ball, with a person in it, right behind you.

This for sure is like a real life re-enactment of the Indiana Jones movie with the giant boulder barreling down behind him. To be truthful this is pretty much the only way you could get me to run, but it looks hilarious. Well, until the giant ball knocks you down and rolls over you. Plus you would need a course that can keep the ball contained on the sides. Thanks god for Go Pros to get an inside and outside look at the shenanigans.