A paraglider flies in front of Aiguille du Dru (Les Drus) nearby to Chamonix in France.
Footprints in the snow at dusk during a winter ascent of Braigh nan Uamhachan in the West Highlands of Scotland.
Scotland Munro Round record holder, Donnie Campbell, running on the horns of Beinn Alligin in Torridon in the North-West Highlands of Scotland.
T3's Extrema Italia gravel bike
Close-up detail of T3's Extrema Italia gravel bike
Close-up detail of T3's Extrema Italia gravel bike
Close-up detail of T3's Extrema Italia gravel bike
Donnie Campbell and T3's Extrema Italia gravel bike
Donnie Campbell riding T3's Extrema Italia gravel bike
Donnie Campbell, An Turas Mor record holder, preparing to go gravel cycling above Fort Augustus near Inverness in Scotland.
Donnie Campbell, An Turas Mor record holder, preparing to go gravel cycling above Fort Augustus near Inverness in Scotland.
Donnie Campbell wearing gravel cycling shoes by Rapha and socks by Teko.
Donnie Campbell, An Turas Mor record holder, gravel cycling above Fort Augustus near Inverness in Scotland.
Donnie Campbell leaping beneath Basteir Tooth on Am Basteir ('The Executioner') in the Black Cuillin on the Isle of Skye in the North-West Highlands of Scotland.
Donnie Campbell running beneath the Old Man of Storr on the Isle of Skye in the North-West Highlands of Scotland.
Donnie Campbell running on the rock formations near the Old Man of Storr on the Isle of Skye in the North-West Highlands of Scotland.
Charlie Lees mountain running in the Grey Corries, Scotland
Portrait of Professor Charlie Lees
Gore-sponsored endurance athlete Naomi Freireich mountain biking on Beinn Alligin, a Munro in the North-West Highlands of Scotland.
Gore-sponsored endurance athlete Naomi Freireich mountain biking on Beinn Alligin, a Munro in the North-West Highlands of Scotland.
Gore-sponsored endurance athlete Naomi Freireich mountain biking on Beinn Alligin, a Munro in the North-West Highlands of Scotland.
Gore-sponsored endurance athlete Naomi Freireich carrying a mountain bike at night on Beinn Alligin, a Munro in the North-West Highlands of Scotland.
Gore-sponsored endurance athlete Naomi Freireich mountain biking on Beinn Alligin, a Munro in the North-West Highlands of Scotland.
Portrait of mountain guide Paul Tattersall (Go Further Scotland) on Liathach, a Munro in the North-West Highlands of Scotland.
Paul Tattersall running on Liathach, a Munro in the North-West Highlands of Scotland.
Paul Tattersall running on Beinn Eighe, a Munro in the North-West Highlands of Scotland.
Paul Tattersall running down the scree shoot on Beinn Eighe, a Munro in the North-West Highlands of Scotland. I
Donnie Campbell wearing Salomon Sense Ride 2 trail running shoes on the Isle of Skye in the North-West Highlands of Scotland.
Scottish ultra runner and adventure racer, Joanne Thom, running in Belhaven Bay, near Dunbar, Scotland.
Alexis Basso trekking across the rocky boulder field en route to Col de la Portette and Refuge de Platé near Passy Plaine-Joux, France.
Alexis Basso ascending to Col de la Portette and Refuge de Platé near Passy Plaine-Joux, France.
Competitors make their way towards the waters of Loch Shieldaig in front of a burning Celtman logo at the start of the Celtman Extreme Scottish Triathlon.
Edinburgh-based endurance athlete Stuart Macleod
Portrait of Edinburgh ultra runner Joanne Thom near Tyninghame beach, Scotland.
Alex Haken peering into a crevasse on the Tour Glacier in the Chamonix Alps, France.
In the sunglasses of Alex Haken, Stas Burek can be seen climbing up snowy rocks en route to the east spur of Carn Dearg Meadhonach, a grade II winter climb in the West Highlands of Scotland.
Climbers on the crevassed slopes of Mont Blanc du Tacul during the Three Monts route to Mont Blanc above Chamonix in France.
German triathlete Dirk Zangen, road cycling before winning the 2015 Celtman Extreme Scottish Triathlon.
German triathlete Dirk Zangen, road cycling before winning the 2015 Celtman Extreme Scottish Triathlon.
Portrait of German triathlete Dirk Zangen, winner of the 2015 Celtman Extreme Scottish Triathlon.
Portrait of German triathlete Dirk Zangen, winner of the 2015 Celtman Extreme Scottish Triathlon.
Competitors running on Beinn Eighe during the running leg of the Celtman Extreme Scottish Triathlon.
David Hetherington ascending the Scorrie amidst spindrift during a winter round of Driesh and Mayar, two Munros in the Cairngorms National Park, Scotland.
A surfer on a breaking wave near Playa de las Americas, Tenerife, Canary Islands.
Mark Mulrain descending the Eas a' Chathaidh rapid (Grade 5) near Bridge of Orchy, Scotland.
A surfer wipes out on a breaking wave near Playa de las Americas, Tenerife, Canary Islands.