Non-specific chronic low back pain is the main cause of public spending on health care and labor, with a prevalence of 10.2%. Its therapeutic management is difficult, with moderate levels of pain and persistent disability over time, influenced by psychosocial factors, such as "fear-avoidance" beliefs. The supervised therapeutic exercise program associated with an educational component is one of the most effective interventions to reduce pain and disability in these patients, but its efficacy seems to be less if there are erroneous beliefs, avoidance attitudes, or fear of physical activity, since it makes it difficult to follow the recommendations. The Back School would address this problem, seeking to improve pain, disability and increase quality of life.

The main objective of this study is to evaluate the influence of the intervention of the Back School of the Hospital Universitario Insular de Gran Canaria in reducing the levels of "fear-avoidance" beliefs in patients with non-specific chronic low back pain.

Inclusion Criteria:

• Diagnosis of non-specific low back pain, age 18-65 years, acceptance of voluntary participation and signature of the informed consent document.
• Acceptance of voluntary participation and signature of the informed consent document.
• Sufficient oral and written knowledge of the Spanish language
• Absence of any other educational intervention at the present time.

Exclusion Criteria:

• Presence or suspicion of red flags
• Cognitive impairment
• Spinal surgery
• Intolerance to physical activity
• Litigation pending resolution
• Pregnancy or postpartum less than 6 months
• Withdrawal from the study (signature of the informed consent revocation document).