Ключевые слова: 4k, active, athlete, athletic, background, boy, caucasian, compete, concept, count, countdown, course, exercise, fast, field, finish, fitness, hands, lane, legs, line, man, meter, outdoor, panorama, pattern, perspective, prepare, race, racecourse, racetrack, run, runner, running, school, shadow, speed, sport, sprint, stadium, start, success, texture, track, way, win, winner,