Ключевые слова: app, athlete, background, caucasian, cellphone, checkup, closeup, connected, control, electrical, female, fitness, gadget, girl, graph, hand, health, heart, heartbeat, holding, lady, mobile, mud, number, outside, phone, pulse, pulsometer, rate, run, runner, running, smart, smartphone, smartwatch, tech, technology, watch, wireless, with, woman, women, young,