Ключевые слова: adult, adventure, alone, cropped, desert, dune, earth, exercise, exercising, explore, extreme, feet, fit, fitness, footprint, footstep, geography, going, healthy, heat, hot, jogger, lifestyle, male, man, men, nature, one, orange, outdoors, outside, pattern, people, person, place, research, route, sahara, sand, sandy, science, shoes, sport, sporty, step, summer, sunlight, terrain, trace, track, travel, trekking, walk, walking, warm, way,