This study of Medical Qigong treatments (not exercises) focuses on back pain.
“Through qigong techniques, they have achieved a success rate of 90%. By using qigong, they can reduce muscle pain, and adjust muscle tension so that the dislocated joints and muscles can regenerate. Qigong also is successful in the adjustment and balance of the spinal column so that the dislocated spinal column may return to a normal position.”
Clinical Research: https://www.qigonginstitute.org/abstract/813/qigong-s-curative-effect-on-lumbago-and-joint-pain