Hiking trail from Niesen mountain, Canton of Bern, Switzerland

Rock climber in action on the world-famous limestone cliffs of Chulilla, Valencia region, Spain

Cyclists at Kleine Scheidigg, Jungfrau Region, Bernese Oberland, Switzerland

Rock climber in action at Leonidio, north-eastern Peloponnese, Greece

Rock climber in action on the world-famous granite boulders of the Buttermilks, Bishop, Sierra Nevada, California, United States of America

Rider and horse, Eure et Loir department, region Centre-Val de Loire, France, Europe

Rock climber in action, Cornwall, England, United Kingdom, Europe

Adult female polar bear (Ursus maritimus) yawning with mouth open on multi-year ice floes in Franz Josef Land, Russia, Eurasia

Kayakers between the floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Hiker, Calanque d'En-Vau in Calanques National Park, Cassis, Bouches-du-Rhone, French Riviera, Provence-Alpes-Cote d'Azur, France, Europe

Hiker on path along levada (aqueduct) of Green Cauldron (Caldeirao Verde), Madeira island, Atlantic Ocean, Portugal

Three hikers at foot of Tre Cime di Lavaredo (Three Peaks of Lavaredo), Three Peaks Nature Park, Dolomites, UNESCO, South Tyrol, Italy

Hikers on path overlooking the Lago dei Piani inferiore, Three Peaks Nature Park, Dolomites, South Tyrol, Italy

Hikers on path between Locatelli and Pian di Cengia refuges with Punta dei Tre Scarperi behind, Three Peaks Nature Park, Dolomites, South Tyrol, Italy

Electric mountain biker off the road from Zagora to the south (N 9), Draa River valley, Province of Zagora, Region Draa-Tafilalet, Morocco

Electric mountain bike riders on track between Ouarzazate and Ait Ben Haddou, Ounila River valley, Ouarzazate Province, Draa-Tafilalet, Morocco

Cyclist on promontory facing the Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Cyclists with mountain pedelec on road connecting Tizi n'Tichka Pass to Telouet village, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Bikers on the unpaved road going up from Anmiter to the village of Tighza, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Hiker on Maja Jezerce, standing at 2,694 metres (8,839 ft) above the Adriatic, the highest peak in the high Dinaric Alps, Albania, Europe

Hikers hiking in Andean mountains towards Rainbow mountain, Pitumarca District, Cuzco Region, Peru, South America

Rafting, Snowdonia National Park (Eryri), Wales, United Kingdom

Trail runner on a mountain path, France

Trekkers in Cadlimo valley, Val Piora, Canton Ticino, Switzerland

Rambler refreshing herself at the torrent, Riva Valley (Val di Riva) (Reintal), near Ahrntal (Valle Aurina), South Tyrol (Alto Adige), Italy

Two young women wearing canyoning gear in Wadi Shab, canyon near Tiwi, Sultanate of Oman, Arabian Peninsula

Woman practising yoga poses among sandstone rock formation in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Woman practising yoga poses among sandstone rock formation in the desert canyons of the Ashar Valley, Medina Province, Saudi Arabia

Woman hiking in High Tatra mountains in winter, Poland

Old man on mule and cyclist with mountain pedelec on road from Tizi n'Tichka Pass to Telouet, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Old man on mule and cyclist with mountain pedelec on road from Tizi n'Tichka Pass to Telouet, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Hiking trail in the arid gorge canyon landscape of Los Cahorros Monachil, Monachil, Sierra Nevada, Granada, Andalusia, Spain, Europe

Ondarreta Beach, La Concha Bay, San Sebastian, Bay of Biscay, province of Gipuzkoa, Basque Country, Spain, Europe

Hikers on Rabacal levada walk towards the 25 Fountains cirque, Madeira island, Atlantic Ocean, Portugal

Semi-arid landscape near Tazert, Al Haouz province, Morocco

Cyclist on promontory facing the Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Biker on the path to the perched village of Tighza, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Bike rider off the road from Telouet to Ait Ben Haddou, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Climber bouldering near St. Ives, Cornwall, England, United Kingdom

Women running on snow in winter

Caucasian woman leaning on car bumper tying shoelace

Paraplegic woman in wheelchair working out in physical therapy

Paraplegic woman working out in physical therapy

Caucasian women running on beach

Paraplegic woman working out in physical therapy

Hispanic man jogging in park

Native American woman running and jumping in desert

Caucasian woman near car texting on cell phone

Women running and celebrating on snow in winter

Mixed Race woman running under urban bridge

Caucasian runner posing with arms crossed in winter

Caucasian woman checking the time on wristwatch in winter

Runners listening to earbuds and resting

Caucasian woman standing with hand on hip

Caucasian woman running in suburban street

Caucasian woman standing in grass resting

Women running on snow in winter

Mixed Race woman running up urban staircase

Runners posing and flexing muscles in winter

Caucasian woman running on path in park

Caucasian woman running on beach

Women running on snow in winter

Caucasian woman running in suburban street

Caucasian man running on staircase on bleachers

Caucasian woman running on hill

Woman running on sunny forest path

Black woman running on treadmill

Caucasian man running on purple bleachers

Woman running in forest

Woman running on forest path

Caucasian woman running on hill

Caucasian woman using cell phone outdoors

Black man running on treadmill in garage

Caucasian runner listening to cell phone with earbuds in winter

Mixed Race woman running under urban structure

Caucasian woman listening to cell phone with earbuds

Black runner listening to cell phone with earbuds in winter

Hispanic woman running on path in park

Smiling Mixed Race man running in field

Smiling Mixed Race man running on footbridge

Mixed Race woman running on path near beach

Caucasian woman stretching leg

Women running on snow in winter

Black woman listening to cell phone with earbuds

Black runner listening to cell phone with earbuds in winter

Caucasian woman standing in grass resting

Black man running in park

Women running on snow in winter

High angle view of Mixed Race woman running on sidewalk near mural

Native American woman running in desert

Caucasian woman standing in grass checking the time on wristwatch

Smiling Mixed Race woman running on sidewalk

Caucasian woman stretching arms

Native American woman running in desert

Mixed Race mother and daughter running under palm trees

Mixed Race woman running on sidewalk near mural

Native American woman running in desert

Women running on beach

Legs of mixed race woman running in grass near waterfront

Portrait of Hispanic woman resting with towel outdoors