Ключевые слова: active, activity, bicycle, bicycling, bicyclist, bike, biking, boy, caucasian, child, childhood, children, cycle, cyclist, exercise, female, field, friend, friends, friendship, fun, girl, group, happy, healthy, helmet, hold, kid, kids, leisure, lifestyle, male, outdoor, outdoors, outside, park, people, person, recreation, ride, riding, smiling, sport, summer, sunny, team, together, young,