Ключевые слова: ache, arthritis, back, back pain, backstroke, caucasian, cramp, elderly, emotional stress, emotions, expression, facial expression, failure, hands, health care, human, illness, lower back, man, massage, mature, medical, medicine, muscle, old, pain, painful, person, physical, pressure, retired, retirement, senior, sick, spinal, spine, suffering, symptoms, touching, uncomfortable, weak, weary, white,