Ключевые слова: adult, athlete, back, backache, body, build, caucasian, cramp, effort, ethnicity, exercising, hand, health, healthcare, healthy, human, illness, injury, jogging, lifestyles, lumbago, lumbar, males, man, marathon, massaging, medicine, men, muscle, muscular, one, only, outdoors, pain, park, people, person, physical, problems, sports, stretching, touching, training, young,