This study evaluates whether different explanations given to patients with long lasting back pain influence a physical therapy treatment technique. Half of the patients will receive an explanation of the proposed treatment technique focusing on how their joints are moving and not moving. The second half of the group will receive the same treatment technique as the first group, but their explanation of the technique's purpose will focus on how their brain interprets the information. The study aims to determine if patients have a different response to the treatment based on the words chosen to explain the technique.