An average human being looking at the topo for the North face Ultra Trail du Mont Blanc would say: 'ouch' before reaching for a demi in Chambre Neuf. Particpants run 166km with 9,500 metres of elevation gain over a 48 hour period with the winning men coming finishing in just over 20 hours. A sport for crazy people or an immense feat of human endurance? Certainly Chamonix embraces it with fervour with the whole town centre turned over to the start and finish lines. An event not to be missed.