This man performing tricks on a ribbon dozens of feet in the air is Jan Horose, an expert slackline athlete with multiple world records. Unlike tightrope, slacklines are designed to stretch and bounce to give that little bit of extra fun and danger some daredebbles were looking for. Jan is one such daredevil and has completed some amazing feats. Aside from multiple world records, he's also the first and only slackliner confirmed to have completed a double backflip after six years of practice and failure. How close to the ground with the line have to be for you to try slacklining.