Yoga has been shown to improve pain and function compared with no exercise in people with chronic low back pain (LBP), but treatment effects are small. Given that yoga is a mind–body intervention that addresses physical as well as psychological factors, it may be more effective for patients with chronic LBP who are at high risk of poor prognosis. The study aims to investigate the efficacy of a 12-week yoga programme combined with education in reducing pain and disability for individuals with chronic LBP at high risk of poor prognosis at short (12 weeks) and intermediate (24 weeks) terms, compared with a control group receiving education only.

A randomised controlled trial will include 110 adults with chronic non-specific LBP reporting an average pain intensity of 3 points or more on a 0–10 scale over the past week and classified as high risk of poor prognosis (ie, scoring 50 points or above) on the Orebro Musculoskeletal Pain Questionnaire short-form. Participants in the control group will receive an educational booklet and attend three face-to-face lectures over a 3-month period. In the intervention group, in addition to the booklet and lectures, participants will attend group yoga sessions twice a week for 12 weeks, totalling 24 yoga sessions. The primary outcome is disability assessed at 12 weeks, measured using the Roland-Morris Disability Questionnaire.

The study was approved by the Human Research Ethics Committee of Universidade Federal de Minas Gerais (Protocol number CAAE: 57028022.0.0000.5149). Findings will be disseminated to trial participants, clinicians and the broader public and scientific community.

NCT05953155.