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Yoga, a stretching program, and a self-care book on low back pain were compared in a three-armed randomized trial for patients with chronic low back pain. The findings showed that yoga was significantly more effective than was using the self-care book, whereas yoga and stretching classes were equally effective. The benefits lasted for at least 26 weeks.Sherman K, et al. A randomized trial comparing yoga, stretching, and a self-care book for chronic low back pain. Arch Intern Med 2011;171:2019-2026.