The best thing for me has been to change several times through the day. I start off in a random office chair. Mid-morning I switch to sitting on an exercise ba

The best thing for me has been to change several times through the day. I start off in a random office chair. Mid-morning I switch to sitting on an exercise ball. In the afternoon, I sit at the kitchen table for a while, and then move back to either the office chair or the ball.