Motivated by the threads started by those with chronic pain.
I've had issues with my back for years, and had all the scans, X-rays etc. It's muscular, so I'm fortunate, and I learned to live with it (including constant sciatica). I tried every exercise I could think of, including pilates classes run by physios specialising in back pain, but everything I tried made my back worse. The first few weeks would be fine but then, wham! Intervention needed to get me on my feet again.
Years ago I bought a DVD (remember those??!!) about tai chi. I watched these elegant, calm people going through the various poses and tried to follow but, being a tad dyspraxic, it was hopeless. However, two years ago, in desperation, I started googling "What exercise can I do with a bad back?" and tai chi kept coming up. So, I took the plunge and found a class where the instructor's credentials stacked up and the reviews were excellent. It was the best thing I ever did. And to anyone who thinks it's not 'real' exercise I'd say - just try it! I've recently had to have three weeks off everything as I've been really unwell. After returning to my tai chi class I honestly felt as though I'd had such a workout! It may look simple, but it engages every muscle group and is so good for the mind too: I can't think about anything else during classes.