I had back and neck problems from sitting too long.
I burned through various chairs, exercise balls, stools, … and then I put a note on my desk that is a reminder to stretch for 5 minutes of every hour, do yoga every day, stand up and walk around while reading short things on paper, and go for a walk or to the gym every day.
Back problems gone. Despite getting significantly older have not returned…
So to me it isn’t the chair, it is how you occupy it and what you do in your day.