Ключевые слова: activity, adult, african, armband, athlete, athletic, concentrated, earphones, enjoy, exercise, field, fit, fitness, flexible, hands, jogger, listening, male, man, mobile, morning, music, outdoor, outdoors, outside, people, preparation, recreation, relaxed, resting, runner, smartphone, smartwatch, sport, sportsman, stretching, summer, sunrise, tracker, training, warming, workout, young,