Exercise and Mindfulness in Patients With Non-specific Chronic Low Back Pain: The BACKFIT Project

Inclusion Criteria: * Be previously diagnosed with NSCLBP pain by a healthcare professional according to the criteria established by O'Sullivan et al. * Intend to participate in the intervention and perform all the tests included in the study. * Able to read and understand informed consent, as well as the objective of the study. * Able to walk and move without outside help. * Able to communicate without problems * Be between 18 and 65 years old. Exclusion Criteria: * Having spondylolysis, spondylolisthesis, canal stenosis, degenerative disc disease, and/or disc herniation, tumor, trauma or fracture of the lumbar and lower limbs, Cauda equina syndrome, and radicular leg pain (given that spine degeneration issues are commonly present in asymptomatic individuals and increase with age, only serious lumbar structural disorders were considered). * Having lumbar surgery as source of pain. * Having acute or terminal illness. * Having medical prescription that prevents the performance of the tests. * Having injury or circumstance that makes it impossible to perform the tests correctly. * Having other physical or mental illness that prevents participating in the intervention.