Sitting at a desk

How do you mamas comfortably sit at a desk all day. I am able to get up and walk. I am in a classroom and when I’m sitting at my desk I can’t seem to get comfortable! 😩😩 anyone have any tips or tricks? To be honest I can’t sit in any chair or even the couch without getting uncomfortable after a short amount of time. Is this just what the last 7 weeks are going to be like! 😭😭