This.

Walking is surely if one of the best things you can do to yourself if you have an otherwise sedentary lifestyle - actually uses a lot of muscles, feels less of a chore because you can easily be preoccupied by multiple other things in parallel (enjoying the view, thinking about things, having a phone call, listening to a podcast, thinking about your destination, etc.).

I've been working remotely for several years now, but one of my jobs used to start later late in the day, so I had some free time before that, which I used to walk around doing chores - felt great. Once I moved to the other job, with a more traditional schedule starting in the morning and ending in the evening, but still a bit off for my timezone, I stopped walking as much - gained a lot of extra weight just because I stopped "exercising" as much due to having awkward hours to do chores before or after work.

I'm relatively sedentary and don't exercise much and I'm completely pain free in my 30s so I feel like that's not the only factor.