Cognitive Functional Therapy Compared With Pilates in Elderly Patients With Chronic Low Back Pain

Inclusion Criteria: * A main complaint of pain in the area between the 12th rib and buttock crease with or without accompanying non-radicular leg pain; * Episode of ongoing low back pain for at least 12 weeks' duration; * Presenting to a primary care clinician at least 6 weeks ago for this episode of LBP; * Being able to walk independently (with or without aids); * Ability to understand Portuguese well enough to be able to fill in the questionnaires. * Medium or high risk score on STartback screening tool. Exclusion Criteria: * Known or suspected red flag disorders like fracture, malignancy/cancer, cauda equina syndrome or progressive neurological disorder, inflammatory or infective diseases of the spine; * Suspected radicular pain (dominant leg pain, positive neural tissue provocation tests and/or any two of altered strength, reflexes or sensation for the same nerve root, assessed clinically); * Spinal surgery \< 6 months previously; * Invasive procedures for pain relief (ex: epidural injection, rhizotomy) in the last three months; * Scoliosis (if considered the primary cause of pain); * Unstable heart conditions; * Chikungunya or Dengue virus disease transmitted by mosquitoes; * Relevant cognition deficit measured by 10 point cognitive screener, with a cut-off point of less than 8 points, 18 for participants with elementary education, and 26 for participants with secondary and/or higher education; * Post Covid-19 sequelae of pain.