Ключевые слова: 1819 years, 2024 years, activity, beauty, beijing, bicycle, china, chinese ethnicity, color image, concentration, cycle, cycling, determination, endurance, exercise bike, exercising, gym, handlebar, happiness, health club, healthy lifestyle, holding, horizontal, indoors, instructor, lifestyles, looking away, motion, muscular build, photography, positive emotion, side view, smiling, spinning, sport, sports clothing, sports training, the human body, three people, vitality, wellbeing, young men, young women,