When you think you want to go for a walk, you should go for a walk. I found myself thinking about my mother’s last couple of years today, how inaction and slow deterioration went from “not feeling like it” to “not being able to” for her. Then, of course, after that came that the more fundamental and permanent inability to go for anything at all…eventually the things you don’t do become the things you can’t do. So go do them.
Better that than sitting there as your bones get brittle and your nerves conspire against you.