It's like weird Extreme Sports
Climbers in America’s Yosemite Valley spent their downtime honing their balancing skills on loose ropes strung up between tall trees and rocks. Although balancing was more hairy they realized the slackness of the rope allowed them more flexibility. But while swaying across a void thousands of metres deep was a buzz - foot rolling was not. The solution: flat nylon webbing which in turn added more bounce to the mix. In 2006 Christian Schou set the record for the highest slackline by walking across a giant rubber band 1000 metres - the equivalent of three Eiffel towers - above a Norwegian fjord. But he forgot to register with Guinness World Records. It was only after Aleksander Mork repeated the trick the following year and bagged the certificate that Schou was sent a belated one.