Stock photography, photos: A man running in snow Stock photos of A man running in the snow during winter in Martis Valley, CA. Photograph: © William Stevenson Click for a larger image and more information Keywords associated with this stock photo: running, run, runner, inspiration, distance, fast, action, active, effort, energy, liveliness, endurance, determination, momentum, motivation, strong, aerobic, challenge, desire, excellence, difficult, winter, cold, snow, man, male, solo, alone, self, reliance, morning, sierra mountains, California, CA, white, training, outdoor, outdoors, outdoorsman, outside, sports, sport, sportsman, recreation, recreational, exercise, exercising, physical fitness, one, 1, person, 20s, twenties, 30s, thirties, athlete, athletic, vertical, Pres