Stock photography, photos: A couple trail running Stock photos of A man and woman running at sunset on Mount Lincoln, CA. Photograph: © William Stevenson Click for a larger image and more information Keywords associated with this stock photo: Running, runners, run, training, back country, action, active, effort, energy, liveliness, determination, momentum, motivation, strength, strong, aerobic, desire, sierras, man, woman, morning, evening, summer, partners, CA, California, sierras, alpine, horizontal, Outdoor, outdoors, outside, sports, sporting, sport, exercise, physical, fitness, outdoorsman, sportsman, adult, young, adventure, adventuring, twenties, 20, s, 30, thirties, 2, two, people