Steelcase or Herman Miller, find them used from local offices going out of business. Offer $50 and see if you get lucky.

It really depends on how tall you are, your body type, and your budget. I'm small, so I hate the older Aerons (which is almost all my office had when I started), but the newer ones are a lot more adjustable so it might be better. I have a Steelcase Amia at home that I liked enough to order for work, too. Both of those chairs are pretty expensive though, so they may not be realistic recommendations.

I have a Hayworth Zody but would also recommend steelcase gesture, knoll generation, and Herman miller aeron. I got mine from the used office furniture store in town for 200. Ordered new arm rest caps to replace the old ones and it is going strong several years later. Also second those that suggest standing desks, used office furniture place again for that, I have a $1200 steelcase that was 200ish but like new.

Don't think they used to be called this but I've been using a decent Staples mesh chair for 4 years now and it's AMAZING without having to spend 300 dollars. It's either this one or a slightly more expensive one made out of nicer materials

https://www.staples.com/union-scale-flexfit-hyken-ergonomic-mesh-swivel-task-chair-maroon-un59462/product_2257054

I have the aeron, it's nice but a bit uncomfortable if you sit in it in any sort of non standard way, I sit with my legs crossed and my cat in my lap and unless I pad the heck out of the bottom with extra pillow or blanket the hard plastic digs into my feet and legs.

For me a far more comfortable approach is a monitor on a stand and a comfortable easy chair, along with a split ergonomic bluetooth keyboard. Embrace our wall-e future

I have a steelcase chair I like a lot. Not sure of the exact model but it’s got great back support. I paired it with an autonomous standing desk to stretch my legs here and there when I’ve been sitting too long.

I've lobbied for standing desks since I got mine and not about to stop ! If you're able, consider getting one. Mine changed my life. I alternate between standing and sitting throughout the day. And it's not just a matter of comfort or back pain (which btw is completely gone): I'm generally more awake, active and productive now. Before that I worked standing up for about a year and a half, and while the change was good, that was excessive, and my knees started to hurt after some time. That's when I understood that what really matters for long-term comfort and health at a desk job is movement. All the best,

Do you tend to sit upright with your feet flat on the floor? I went with a wide flat chair so I could sit cross legged. I’ve tried and disliked the ergonomic chairs that lean slightly forward

For mid-tier chairs I can recommend both the Markus from Ikea and the Ergonomic Chair from Branch. The Markus is generally more relaxing and feels really nice to lean back into. Whereas the Ergo feels more like it wants you to sit proper (and it's adjustable). The Ergo def takes an adjustment period do to it's "proper" posture, but after having it for a couple months now I don't even notice

Either should run you ~300 USD

I like Hercules office chairs. They're meant to hold 300lb people for 8 hours a day. I'm not that big, and I don't sit that long, but the chair has lasted me a lot longer than cheap or even moderately priced office chairs.

I've never tried those expensive Herman Miller ones though. That's just too outside my budget and mesh doesn't look very comfortable to me. Not too mention my cats would shred that up.

I stand most of the time. Use the chair when I get tired.

What is your budget?

If I was required to sit in a chair for hours, I would insist my supervisors allow me to sit on this:

And of course these are made in actual chair models too, with a stable base and a backrest and everything, but I would prefer the actual ball. Very healthy for your spine and core muscles, if you're required to sit, this is the healthiest method.

I got a "Actiu Tnk Flex" 2 years ago and so far so good.

Maybe not for everyone, but I really enjoy my Swopper stool. Mostly because I can't sit still and it allows me to bounce around all day. It takes some time to get used to, but it's great for keeping your core active during the day.

One downside is that I caused sea sickness with a colleague during a conference call due to all the bouncing :)

Whatever chair you end up getting try to swing a standing desk if you can

Herman Miller Embody.

I know this might sound stupid but for several years, I was using a regular kitchen chair with a towel to sit on and a cloth blanket to make the back more comfortable to lean against. Even though I have a different, much more expensive gaming chair, I am still using a towel because the leather sticks to my skin.

Adjustable armrests make a huge difference. Fixed armrests are better than none but really you need to be able to raise them to the right height for you, so your shoulders and back can properly relax. Without supportive armrests your shoulders need to carry the weight of your arms all day.

I actually am comfortable enough in a dining room chair at home (I sit forward not back) so no equipment rec but I am going to recommend yoga and, well, not sitting for hours at a time. Get up and get water. Get up and go pee. Get up and get coffee. Get up up and go pee again. Get up and stretch. It's very risky to your health to sit for too long.