The key is to be able to move. First work out what is required so you can do your job well. Do you need to be able to shut a door? Do you need day light? Do you need variety to keep you fresh? What is it?
Now you’ve got your bounds… so we will work within them.
Variety is the name of the game. At home you have the luxury of not worrying about disrupting colleagues by moving around LOTS.
Trying standing … put some boxes on a table or the kitchen bench
Trying sitting … on the floor .. on a chair
Most of all mix it up. Take a 15 minute walk at 12noon or as soon after as is practical. If I’m with a client at noon I put on my shoes as they do when we’ve finished and we leave together. If I’m mid writing, I just stop and go. Try it, you’ll be amazed how much more you get done in a day
