Mind you, I'm not a health professional, but here are some ideas. Take a walk at lunch. Try hobbies that aren't simply sitting. Even something like woodworking

Mind you, I'm not a health professional, but here are some ideas. Take a walk at lunch. Try hobbies that aren't simply sitting. Even something like woodworking or gardening would have one standing and moving; it's not aerobic exercise, but it's still better than sitting. If you do do woodworking, you could build a little stand for your laptop or keyboard to convert your desk into a standing desk :)