Spectacular mountain running – in pictures

Max King runs along the Grand Canyon Photograph: David Clifford/Barcroft Media

Mike Schneiter runs the Capitol Creek trail, between the Saddle of Mount Daly and Capitol Peak in Colorado Photograph: David Clifford/Barcroft Media

Rickey Gates on the Brevent trails high above Chamonix, France Photograph: David Clifford/Barcroft Media

Ted Mahon descending Grant Swamp Pass during the Hard Rock 100 endurance race near Silverton, Colorado Photograph: David Clifford/Barcroft Media

Megan Lund on the Doc Holliday trail between Carbondale and Glenwood Springs, Colorado Photograph: David Clifford/Barcroft Media

Casey Weaver trail-running in Grand Junction at Mount Garfield in the Rocky Mountains Photograph: David Clifford/Barcroft Media

Dakota Jones on the Tour Du Mont Blanc trail in Chamonix, France Photograph: David Clifford/Barcroft Media

Darcy Africa basking in the last light at 12,000 feet on a high altitude training run on Loveland Pass, Colorado Photograph: David Clifford/Barcroft Media

Susan Sauze trail-running to the Bonatti hut on the Italian side of the Alps Photograph: David Clifford/Barcroft Media