Sven Zacek / People in a cross-country skiing competition. Tartu, Estonia, Europe, February.

Uri Golman / Photographer Uri Golman on cross country skies in snow blizzard, Scoresbysund, North East Greenland, March 2009. Model released

Jerry Monkman / A man cross country skiing along the coast at Odiorne Point State Park in Rye, New Hampshire, USA. Model Released. winter 2007

Jorma Luhta / Cross country skier and aurora borealis colours in night sky, northern Finland, winter

Mark Hamblin / 2020VISION / Cross-country skier on snow. Cairngorms National Park, Scotland, December 2011.

David Noton / Man and woman on mountain bikes cycling on Hambledon Hill above the Blackmore Vale, Dorset, England, UK. June 2005.

Orsolya Haarberg / Child cross country skiing, Sandnessjoen (Donna Island in distance), Alstahaug, Helgeland, Nordland, Norway, February 2009

Sven Zacek / People in a cross-country skiing competition. Tartu, Estonia, Europe, February.

Niall Benvie / Legs of man Cross country skiing, Angus, Scotland, UK, November

Niall Benvie / Legs of man Cross country skiing, Angus, Scotland, UK, November

Shattil & Rozinski / Cross country skier, skiing with two dogs, Brush Creek Ranch, Saratoga, Wyoming, USA, February 2010

Ernie Janes / Galloping horse and rider competing in cross country event, Norfolk, UK, April 2009

Ernie Janes / Galloping horse and rider competing in cross country event, Norfolk, UK, April 2009

Jerry Monkman / Man cross-country skiing on First West Branch Pond with White Cap Mountain is in the distance. Greenville, Maine, USA, March 2009, Model released.

Jerry Monkman / Couple carrying cross-country skis at Medawisla Wilderness Camps near Greenville, Maine, USA, March 2009.

Jeff Vanuga / Cross Country Skier's pause to watch Bison {Bison bison} moving through the Upper Geyser Basin in winter, Yellowstone National Park, Wyoming, USA, January 2008

Jeff Vanuga / Cross country skier's watching Bison {Bison bison} in the Upper Geyser Basin, Yellowstone National Park, Wyoming, USA, January 2008

Jeff Vanuga / Snow shoeing / Cross country skiing on Two Ocean Mountain, Togwotee Pass, Shoshone National Forest, Wyoming, USA, December 2008

Jerry Monkman / Looking down on a man cross-country skiing (track skiing) on a groomed trail next to the frozen Ottauquechee River in Quechee, Vermont, USA. Model Released.

Jerry Monkman / A man cross country skiing with his dog on the Catamount Trail, Stowe, Vermont, USA. Model Released.

Jerry Monkman / Looking down on a man cross-country skiing (track skiing) on a groomed trail next to the frozen Ottauquechee River in Quechee, Vermont, USA. Model Released.

Niall Benvie / Cross country skier amongst trees laden with snow, Finland

Juan Carlos Munoz / Cross country skiing through the Gran Paradiso NP, Valnontey, Aosta valley, Italian alps.

Juan Carlos Munoz / Cross country skiers resting outside wooden cabin in Gran Paradiso NP, Valnontey, Aosta valley, Italian alps.

Tim Laman / Skier Phil Atkinson skiing past Rimrock Lake, Beartooth Mountains, Montana, USA May 2008

Jerry Monkman / Cross-country skiing near Little Lyford Pond Camps, Maine, USA

Jerry Monkman / Cross-country skiing across Second Connecticut Lake, Pittsburg, New Hampshire, USA

Jerry Monkman / Cross country skiing along beach next to the Atlantic Ocean, Odiorne Point State Park, Rye, New Hampshire, USA

Jerry Monkman / Cross-country skiing across Second Connecticut Lake, Pittsburg, New Hampshire, USA

Jerry Monkman / Cross-country skiing across Second Connecticut Lake, Pittsburg, New Hampshire, USA

Jerry Monkman / Cross-country skiing on an unploughed road near Second Connecticut Lake, Pittsburg, New Hampshire, USA

Jerry Monkman / Snowshoeing along the shores of Second Connecticut Lake, Pittsburg, New Hampshire, USA

Jerry Monkman / Cross country skiing on the Carriage Roads next to Jordan Pond and the Bubbles, Acadia NP, Maine, USA

Jorma Luhta / Cross country skier with back pack, February, Riisitunturi national park, Lapland, Finland

Jorma Luhta / Cross country skier, February, Riisitunturi national park, Lapland, Finland

Eric Baccega / Person cross country / Nordic skiing pulled by dog (Canis familiaris) Northwest Territories, Canada. March 2007

Eric Baccega / Woman cross country / Nordic skiing pulled by dog (Canis familiaris) Northwest Territories, Canada. March 2007

Eric Baccega / Person cross country / Nordic skiing pulled by dog (Canis familiaris) Northwest Territories, Canada. March 2007

Eric Baccega / Man cross country / Nordic skiing pulled by dog (Canis familiaris) Northwest Territories, Canada. March 2007

Mark Taylor / Cross-country skiing, Lia, Norway.

Larry Michael / Cross country skier, Wisconsin, USA

Larry Michael / Cross country ski racer with frozen moustache and icicles, Wisconsin, USA

LYNN M. STONE / Cross country skiing, St Charles, Illinois, USA

Larry Michael / Person crossing finishing line, cross country ski race, Wisconsin, USA

Larry Michael / Cross country ski race, Wisconsin, USA

Niall Benvie / Close up of boot snad skis for Cross country skiing on snowy tundra, Sylen, Norway

Niall Benvie / Shadow of cross country skier on snowy tundra, Sylen, Norway

Barry Bland / Philippa Funnell of Great Britain, going over cross country jump, Olympic Games, Athens, Greece. 2004

Staffan Widstrand / Long shadows cast by Cross country skiiers - Grovelsjon NR, Dalarna, Sweden.

Staffan Widstrand / Cross country skiing expedition, ecotourism, Grovelsjon NR, Dalarna, Sweden

Staffan Widstrand / Cross country skiing jumping, ecotourism, Grovelsjon NR, Dalarna, Sweden.

Staffan Widstrand / Cross country skiing ecotourism, Grovelsjon NR, Dalarna, Sweden

Staffan Widstrand / Cross country skiing group, ecotourism, Grovelsjon NR, Dalarna, Sweden

Staffan Widstrand / Cross country skiing group, ecotourism, Grovelsjon NR, Dalarna, Sweden.

Staffan Widstrand / Shadow of Cross country skier in snow, Varmland, Sweden.

Staffan Widstrand / Cross-country skiing, Varmland, Sweden

Staffan Widstrand / Cross country skiing in the mountains of Jamtland, Sweden

Jorma Luhta / Man cross country skiing past trees laden with snow, Lapland, Finland

Carol Walker / Bay Thoroughbred horse jumping cross-country jump, Colorado, USA.

Jim Brandenburg / Orange Tabby cat named Skittles, traveled 350 miles cross-country to return home after being separated from his owners, Minnesota

Jim Brandenburg / Orange Tabby cat named Skittles, walking along railroad tracks, traveled 350 miles cross-country to return home after being separated from his owners, Minnesota

Jim Brandenburg / Orange Tabby cat named Skittles, walking along railroad tracks, traveled 350 miles cross-country to return home after being separated from his owners, Minnesota

Jim Brandenburg / Orange Tabby cat named Skittles, standing on log, traveled 350 miles cross-country to return home after being separated from his owners, Minnesota

Jim Brandenburg / Orange Tabby cat named Skittles, sitting on railroad tracks, traveled 350 miles cross-country to return home after being separated from his owners, Minnesota

Asgeir Helgestad / Hikers cross country skiing to top of Haardangererjokulen, Hardangervidda, Finse, Norway

Asgeir Helgestad / Skiis and rucksacks outside mountain hut after snow storm. Finse, Hardangervidda, Norway

Asgeir Helgestad / Cross country skier looking towards Hardangerjokulen glacier, Finse, Norway

Asgeir Helgestad / Cross country skiers, Bleporten, Blefell mountains, Norway

Asgeir Helgestad / Cross country skiers, Bleporten, Blefell mountains, Norway

Jim Brandenburg / Orange Tabby cat named Skittles, walking along railroad tracks, traveled 350 miles cross-country to return home after being separated from his owners, Minnesota