Damian Cooksey walks a 405 foot world record length slackline at Pole Mokotowskie in Warsaw, Poland. March 4, 2007 Note: This is no longer the record for the longest slackline. The current record is 506 feet (154 meters), which I walked on July 10, 2007 at the English Garden in Munich, Germany. (Thanks to my friend Andreas Thoelke for rigging the line!) I do have video of the walk, I just haven't gotten around to posting it yet... (keywords: emerging sports . extreme sports . outdoors . adventure sports . x-games . x games . parkour . action sports . board sports . cross training . cross-training . free running)