Ключевые слова: activity, adult, app, background, beat, break, cardio, cardiology, care, check, checking, closeup, counting, exercise, female, fitness, gadget, hand, health, heart, heartbeat, isolated, lifestyle, light, mature, measurement, measuring, people, person, pulse, rate, rest, rhythm, run, runner, smartwatch, sport, sporty, time, tracker, training, white, woman, workout,