Killian Jornet breaks Mont Blanc speed record, runs to summit and back down in under 5 hours

Spanish mountain runner Killian Jornet smashed the longstanding record for running to the summit of Mont Blanc and back down again, covering the route in an astonishing 4 hours, 57 minutes and 40 seconds on Thursday. He broke the previous record, set in 1990 by Pierre André Gobet, by 13 minutes.