The goal of this clinical trial is to investigate the effectiveness of yoga for patients with chronic low back pain and high risk of poor prognosis. The main question it aims to answer is: \- In patients with back pain and high risk of poor prognosis, what is the effectiveness of yoga plus education on reducing pain and disability compared to a control group receiving education alone? A total of 110 patients with chronic low back pain and classified as high risk of poor prognosis according to the Orebro Musculoskeletal Pain Screening Questionnaire (i.e. score ≥ 50 points out of 100) will be recruited for this study. Participants will be randomized into two groups: yoga and control. The yoga group will receive a 3-month course of yoga program consisting of two sessions per week and 3 educational classes. The control group will receive 3 educational classes over a 12-week period. Outcome measures will be assessed at baseline, at post-intervention (i.e. 3-months post randomization) and at 6-month follow up (i.e. 6-months post randomization).