[pen2l]

I use a wooden chair much like this one: https://i.imgur.com/2LZ2d3M.png

What I came to realize after a while of thinking about this is that this is all bikeshedding (at least, it was for my situation). If you have issues of a high severity, it might make sense to invest in a chair to alleviate some symptoms like pain and discomfort. If you have money lying around just waiting to be used, it might make sense to spend it on a cool and nifty Herman Miller or whatever.

But the most important thing, bar none, is you work to have a good posture and physical health thus eliminating the need to be picky about your chairs. If you don't have postural issues, great. If you do, then get working: start with some variant of 5x5 routine, make sure to do good rows with an appropriate amount of weights, and some face pulls with good form.

[temp234]

I use a similar wooden chair or, when just a laptop is fine, sit or squat on the floor. It's a shoes-off house and a nice carpet that I reckon gets cleaned more often than most expensive desk chair seats. I think the floor time improves my flexibility and mobility. A lot of adults in my country aren't comfortable lowering themselves onto the floor or standing up off the floor and I know I'd be among them if it weren't for my arbitrary floor work habits.