In 2015, South African trail running witnessed what could be one of the greatest ever performances in international trail running. Swiss athlete Marc Lauenstein did what was considered impossible. He broke the 4 hour barrier on a course that had seen the record unchallenged at 4h15. Here is a rough GoPro compilation of the day filmed and edited by GoPro SA ambassador Jeff Ayliffe. Camera used was a HERO 4 Silver.