When I started developing back pain from our office chairs a few years ago (proper ergonomic ones), a colleague let me try a kneeling chair that work had gotten

When I started developing back pain from our office chairs a few years ago (proper ergonomic ones), a colleague let me try a kneeling chair that work had gotten for him but which didn't really work for him. It has been perfect for me and my back pain was gone from first use. Not necessarily because the kneeling position is better, but because the chair is just so easy to switch positions in. I can kneel, put one leg up, put both legs up, even sit on it backwards. I'm very much a fidgeter and I think having a chair that lets me fidget with my position easily has really helped. When we moved to WFH during the pandemic, the company subsidized some equipment and I ended up getting a different type of kneeling chair from the same brand: this one rocks back and forth and is also great for fidgeting. I now have both chairs in my house and use them interchangeably (with a small preference to the rocking chair these days). It does not magically fix my posture, but I've had no back pain at all since switching. Both chairs are from Varier (Wing Balans and Variable Balans)