Might be a silly question, but why not walk outdoors? I find this a lot more enjoyable, though I guess it’d 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.
