If you can swap the lift or escalator for a few flights of the real thing, do so.
If you work from home, work upstairs.
Running downstairs every time you want to raid the fridge will burn fat and using stairs generally is great for legs and bottoms. So run up and down them anyway. The winter our heating was on a go-slow and I huddled in the kitchen all day as my office was arctic, I soon saw the difference. Not in a good way.