My old physical therapist had a good point about this. She said focusing only on core strength ignores how your nervous system controls posture without you thinking about it. Trying to "hold" a position all day just makes different muscles tight. It's more about training your body to find a balanced rest position, not doing a constant workout at your desk.

Ever try starting with a movie edit instead?

It's like the universe has a rule that your old place has to get worse right after you leave.