Competitors run as they compete in the 170km Ultra-Trail of Mont-Blanc (UTMB) race, near Chamonix, French Alps, Sunday, Sept 2, 2018. Set up in a breathtaking setting in the heart of the Mont Blanc massif, this 170-kilometer race (105-mile) with a total vertical gain of 10,000 meters is regarded by many as the world’s most difficult ultra-endurance event.
Competitors run as they compete in the 170km Ultra-Trail of Mont-Blanc (UTMB) race, near Chamonix, French Alps, Sunday, Sept 2, 2018. Set up in a breathtaking setting in the heart of the Mont Blanc massif, this 170-kilometer race (105-mile) with a total vertical gain of 10,000 meters is regarded by many as the world’s most difficult ultra-endurance event. (AP Photo/Laurent Cipriani)/RSSA competitor runs up the Grand Col Ferret as he competes in the 170km Ultra-Trail of Mont-Blanc (UTMB) race, near Courmayeur, Italy, Saturday, Sept 1, 2018. (AP Photo/Laurent Cipriani)/RSSCompetitors warm themselves up in front of a fire at the Combal lake as they compete in the 170km Ultra-Trail of Mont-Blanc (UTMB) race, in Courmayeur, Italy, Saturday, Sept 1, 2018. Set up in a breathtaking setting in the heart of the Mont Blanc massif, this 170-kilometer race with a total vertical gain of 10,000 meters is regarded by many as the world’s most difficult ultra-endurance event. (AP Photo/Laurent Cipriani)/RSS
