Jan. 28 (UPI) --A pair of German daredevils took a walk across a slackline suspended between two hot air balloons and earned a world record for their stroll at an altitude of 8,202 feet. Friedi Kühne ...
Slacklining – unlike tightrope walking, which is rigid – uses a flexible polyester webbing that stretches, moves and bounces. The sport has been around since the 80s, with the slackline generally ...