Once upon a time, I was looking for a job and my neighbor was working at an architectural firm. He suggested I apply there and I got the job.
I worked in the mailroom, which was in the basement. Three times a day, I would walk up the stairs to pick up outgoing mail.
There were five floors in the building, so that was a lot of stairs.
I got a lot of exercise.
Plus, I knew all the addresses of the people we worked with, and all the names of the 200 employees, which included my neighbor.
So, if you want to get lots of exercise but never go to the gym, all you have to do is have an architect neighbor who rides the bus (because if he drove a car we wouldn’t have talked about the job), who is working in a place with 5 stories (I think more would be too much) and an open mailroom position.