Ключевые слова: 1, 30, 30s adult, 35 40 years, activity, adults, athlete, athletic gear, athletics, ball, caucasian, free time, human, human being, individual, late 30s, late thirties, leisure, leisure activities, leisure activity, leisure time, life, lifestyle, living, man, one, one person, one person only, outdoors, outside, pastime, people, person, racket, recreation, recreational, s, serving, sports, sports equipment, sports gear, tennis, tennis ball, tennis balls, tennis player, tennis racket, tennis racquet, thirties, whites,