I never understood the obsession with the chair type, model, or manufacturer. I have a normal office chair whose brand I don’t know, and I never had issues despite sitting for long periods of time. The trick first me is to never stay still in one position for more than 30 minutes and to rotate between different positions, leaning forward or backward, and other positions as if I’m sitting on the floor. For example, like the ‘Burmese’ or ‘on a stool’ positions in this picture (1). I also do the usual stretches from time to time.

(1) https://64.media.tumblr.com/fd311523b5965df9b1ff0682c0041c96...