Ключевые слова: 20s, activity, activity tracker, app, caucasian, cell, cell phone, class, close up, connected, copy space, exercise, exercise mat, exercising, female, fitness, fitness monitor, health, healthy lifestyle, horizontal, keeping fit, looking down, mobile, mobile phone, one person, online, people, person, screen, sleep tracker, smart watch, sports clothing, sportswear, tech, twenties, view from above, woman, women,