For kii and anyone else suffering from back pain or other body pain issues.
Since my late teens I have had acute back pian problems, which were helped not at all by an operation in my early 20’s.
For the last 20 years or so I have gone to weekly 1 hour long Feldenkrais sessions, which are basically stretching exercises with a focus on what all your muscles are doing as you stretch.
When going to the regular classes I have no back pain at all. When there is a break, I start to have back twinges after a couple of weeks or so, sometimes becoming more significant.
In short, it works, at least for me.
The wikipedia article is highly sceptical, painting it as complete woo, with no evidence it does any good. All I can say is, that isn’t my experience. It works for me and the woman who runs the classes I attend is woo-free.