Researchers at Harbor UCLA Medical Center in Los Angeles, Calif., found that just four weeks of regular yoga sessions significantly reduced the frequency and severity of chronic pain.

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Yet, for many with back pain, regular yoga is not possible.  Chair yoga is their only way to gain the benefits cited in this study.

For more statistics:

Chronic Pain and High-impact Chronic Pain Among U.S. Adults, 2019

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My experience matches this study in that much chronic pain is improved or at least maintained after only a month on the chair.