Me, I have a disease which is kinda wiping out my connective tissue over time, which includes those lovely soft discs in my spine, dammit. Biggest current issue with that is that it’s getting harder and harder to sit at my desk for more than ~15min without lower back pain ratcheting up…
So I was wondering if anyone here with lower back issues has found a chair that helped them sit?
From L-R, T-B, chair #2 is a saddle chair, which looks kinda interesting. Chair #4 is one I used to have, which seemingly tries to keep the spine perfectly straight-up, but it was also hell on my knees.
Now, chair #3 kinda looks like a Star Trek-style bumper-car that I’d want to ride in my very last visit to an amusement park. 😄

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i bought an exercise ball as a temporary measure until i could afford a decent chair but found it so comfortable i never bothered replacing it, until after about five years it lost its shape and became a big egg with an arse print in it. the problem with that is when it’s warm you quickly get a sweaty undercarriage. so i bought a less complicated version of the kneeling chair in your fourth image like this one:
you can pay a fortune for a varier one or get one for a song from aliexpress etc. it has most advantages of a ball plus you can switch positions to have your feet on the floor, on the rails, on the pads, or some combination. i was worried i’d roll over my toe but it hasn’t happened yet
I have a rocking kneeling chair from Sleekform, which I found a nice middle ground price and quality wise. I’m hyper mobile and have ADHD, so I appreciate being able to sit in a variety of ways on it. I tend to perch with my feet on the knee rests, tbh (I wear slippers in my office). I also rock in it when I need to fidget.