I think it's pretty hard without a radical shift in career. Your training correlates well with sitting/standing & thinking, then writing/typing things.
What worked well for me though was to be quite intentional about a few things:
* started at minimum walking to work - I know this doesn't work for everyone, but some variation (e.g. part way) might. This meant that regardless of how crazy my day got at the very least I had 1 hour of brisk walking - I moved to a 30 min walk from my office.
* got out of the office for a walk of at least 15 min at lunch, pretty much every day
* sit/stand desk and used it, changing position 4x a day usually (i.e. sit for a while, stand for a while, lunch, sit, stand)
* got intentional about some meeting scheduling. e.g. this is going to be a whiteboarding exercise, put it at 10am to break up the morning sitting.
* have a proper fitness routine, and stick to it. Could be activities you like or could be the gym or whatever, but don't let yourself "get busy" and miss too many days. It should be somewhat intense, and somehow cover core & hips & shoulders