Colin Monteath / Man bicycling through bamboo forest, Kyoto, Japan

Jerry Monkman / Man riding his mountain bike through woodland at Moose Brook State Park in Gorham, New Hampshire, USA, August 2008. Model released.

Jerry Monkman / Three people biking at Odiorne State Park, Rye, New Hampshire, USA, September 2008.

Jerry Monkman / Two women biking at Odiorne State Park, Rye, New Hampshire, USA. September 2008, Model released.

Tom Gilks / Gambian children cycling home from school along sand track, Lamin, The Gambia, 2008

Pete Cairns / Young boy riding mountain bike, Cairngorms National Park, Scotland, UK Model released.

Pete Cairns / Man cycling along woodland trail, Cairngorms National Park, Scotland, UK. mountain bike

Pete Cairns / Mountain bikers on forest track, Cairngorms National Park, Scotland, UK.

Pete Cairns / Two mountain bikers cycling along forest track in Scotland, UK.

Jeff Vanuga / Mountain biking, USA.

John & Mary-Lou Aitchison / Cyclist watching Grey wolf on road {Canis lupus} Denali NP, Alaska, USA

Jan Vermeer / Cyclists on path at sunset