Trial bike riding is the most spiteful sport of all. It's the spiritual successor to the first man or woman with a dirt bike to be annoyed by someone saying, "you can't ride that here." Someone at some point needed to jump a stripped down bike off of the trail and onto some boulders for this sport to have even been born. It's only gotten better and more intense since its inception.
This video shows how technical the riding is, with riders often jumping towards spots they absolutely can't see. It's the most nerve-wracking, impressive sport ever.