The measurement of back movement .
D001415:Back / Q000502:physiology; D001696:Biomechanical Phenomena; D006801:Humans; D008159:Lumbar Vertebrae / Q000502:physiology*; D009068:Movement; D013122:Spinal Diseases / Q000175:diagnosis; D013904:Thoracic Vertebrae / Q000502:physiology*