Ключевые слова: active, activity, aged, app, application, back view, beat, calories, caucasian, cell phone, elderly, exercise, female, fit, fitness, grandmother, health, healthcare, healthy, heart, holding, horizontal, internet, lifestyle, mobile, old, one, outdoor, outdoors, people, person, phone, pier, real, screen, senior, sitting, sitting down, smartphone, sport, sportive, technology, textmessage, touch, training, unrecognizable, using, vitality, woman,