I'm super productive on a 28" with yt constantly open slightly hidden behind the terminal window. EDM, chess videos, speedrun videos, having them in the background actually reduces boredom and lets me achieve more. Laptop is on the side with slack in case there is an alert or an important message.

That said, shout out to the well being app that comes with the latest gnome version! I allow it to force me to get up and walk around for five minutes at awkward times. I do light exercises like push ups and australian pull ups or get coffee while I wait. Being forced off the computer while I'm trying to focus actually makes the day more interesting.