Ключевые слова: 7 years, action, activity, asphalt, beginning, bicycle, bicycling, bike, biker, boy, caucasian, child, childhood, cycle, cycling, cyclist, day, driving, emotion, forward, front, fun, healthy, helmet, hobby, kid, lane, learn, lifestyle, looking, motion, mountain bike, mtb, one, outdoor, person, preschooler, recreation, ride, road, rural, safety, schoolboy, sport, street, summer, sunshine, wear, young,