The Riverboarding World is all abuzz with talk about what it would take to set a waterfall vertical descent World Record by riverboard.

The drop on this video is said to be around 50ft high, and a couple of these guys are going over head-first and horizontal.

Some good cross-training for getting your head around what it must feel like to stare down the throat of a 50 footer. Watch the video below (see the guy at around 00:51).