Ключевые слова: active, activity, adult, app, application, athlete, athletic, black, bracelet, cell, close up, closeup, device, exercise, finger, fit, fitness, hand, health, healthy, indicate, jogging, male, mature, measure, men, mobile, person, phone, pulse, run, runner, smart, smartphone, smartwatch, sport, sportswear, technology, time, tracker, training, unidentified, unrecognized, use, using, watch, workout, wrist, wristwatch, young,