Ключевые слова: abstract, active, activity, arm, athletic, background, ball, body, competition, equipment, exercise, exerciser, expander, finger, fitness, flexor, fun, gray, grip, growth, gym, gymnasium, hand, handgrip, health, healthcare, healthy, human, iron, isolated, lifestyle, man, metal, muscle, muscular, people, physical, plan, power, rubber, shape, sport, squeeze, strength, stress, strong, trainer, training, weight, white,