This could be part of why work from home doesn't work for me. I missed having spacious work areas, given my crammed apartment unit. I can simulate the walking for travel to work but that comes in bursts at set times, unlike just walking within a building anytime I feel like it.
Might be a silly question, but why not walk outdoors? I find this a lot more enjoyable, though I guess itβd depend a lot on how foot-friendly your local area is.
I do this every now and then, but this becomes a conscious decision with tradeoffs when I work from home, so I cannot do it daily. I'm not immediately surrounded by conducive walking areas, so there's a threshold of effort and time commitment before reaching the better places. When I go to a workplace, there's no decision to make I just have to walk without question.
My humble suggestion: dress up for walking every time you have to leave your apartment for anything. What made it work for me was taking out the trash. Once the trash is out, and I am out on the street with the right clothes and the right shoes for walking (or even running!) then it is much easier to do it.
It's not always about force of will, it can be about small changes in your environment.