I think the impact of specific workspace arrangements will be different for each person. And no e of these adjustments are going to unlock a torrent of productivity.

From my own experience: * Getting an ear-covering gamer headset was most effective at blocking external sounds, and helping with focus * Replacing my cushioned work chair with a mesh bottom-and-back chair reduced sweating * Having an e-ink frame with certain reminders/affirmations helps me get through tough stretches at work