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