Merryn Thomas,Merryn Thomas / Catamarans taking part in the Extreme 40 catamaran racing series in Cardiff Bay, Cardiff, Wales, UK, September 2012.

Kirkendall-Spring / Perspective of mountain biker over handlebars, Taylor Canyon, Island In The Sky District. Canyonlands National Park, Utah, October 2012. Model released.

Mark Hamblin / 2020VISION / Climbers on ascent of Cairn Lochan in winter, Cairngorms National Park, Highlands, Scotland, UK, January 2011

Jerry Monkman / A kayaker plays in a hole in Tariffville Gorge on the Farmington River in Tariffville, Connecticut. Class III whitewater. May 2007. Model released.

Floris van Breugel / Twilight descends on photographer's mountain camp with light inside tent, in Oregons highest mountain forest on Drake Peak at 8,500 feet. Oregon, USA, January 2010.

Jeff Wilson / Camera crew searching for crevasse to film in, Gorner glacier, near Zermatt in the Swiss Alps, Switzerland. For BBC Planet Earth series, Mountains episode, 2006

David Fleetham / A tow-in surfer drops down the face of Hawaii's big surf at Peahi (Jaws). Maui, December.

David Fleetham / A tow-in surfer drops down the face of Hawaii's big surf at Peahi (Jaws). Maui, December.

David Pattyn / Paraglider in mountain landscape, Bernese Alps, Switzerland, November 2014.

David Pattyn / Paraglider in mountain landscape, Bernese Alps, Switzerland, November 2014.

Graham Eaton / Surfer entering the sea with large waves breaking over the jetty during an easterly gale, Criccieth, Gwynedd, North Wales, September 2013.

Graham Eaton / Surfer entering the sea with large waves breaking on the jetty during an easterly gale, at Criccieth, Gwynedd, North Wales, September 2013.