Sit to Stand workstations are starting to become more mainstream. I use one from Workrite.

These allow you to vary your work position to give your back a rest. As they put it: “Ergonomists agree that microbreaks are an excellent way to reduce the affects of repetitive activities. Rather than squirming in your seat late in the day, give your back a rest by standing for a short time. Alternating between standing and seated positions reduces the need for extended workbreaks, increasing employee productivity.”

I try to switch positions every hour or two.