For me the best option is a floor desk. I found sitting on the floor challenging at the beginning. I even had to re-learn how to get down to and up from the flo

For me the best option is a floor desk. I found sitting on the floor challenging at the beginning. I even had to re-learn how to get down to and up from the floor properly. But with time (and yoga/stretching exercises) my core has gotten stronger and my joints feel great and I can withstand any amount of time sitting on the floor. I'd say the amount of times you get down and up count as mild exercise. I have had no back or any other kind of pain whatsoever, even after longer sessions. A great thing is that you keep changing posture naturally and you have many more ways you can sit or squat on the floor than on a chair. I don't see this mentioned often, but to me it makes a lot of sense. Children prefer sitting on the floor (they haven't experienced any mobility loss yet), hunter-gatherer tribes sit on the floor for most of the day [0], older people in Japan (and other cultures) sit on the floor without much problem, etc., just to mention some examples. [0] https://www.huffingtonpost.co.uk/entry/sitting-all-day-bad-for-health_l_6022a938c5b6d78d444a1819 https://www.huffingtonpost.co.uk/entry/sitting-all-day-bad-f...