Ключевые слова: active, activity, adult, attractive, back, back exercises, balance, ball, body, exercise, exercise ball, fit, fitness, fitness ball, group, gym, gym ball, health, health club, leisure, man, mature, muscles, muscular, people, power, powerful, retiree, senior, seniors, shape, slim, sport, sportive, strength, three, training, vitality, woman, women, workout,