Working at a desk or bench, especially on detail stuff, such as computer research or tiny 1/25 scale (or smaller) model parts, one might have a tendency to stay in a set position longer than realized. I worked at a computer desk at a local nuclear plant between 8 and 14 hours a day for several years researching work orders. My "exercise" during the work day was delivering finished work orders across the complex about three times a day. If I didn't do that, I would fall asleep at my desk. (Wonder why I made that statement?)
Nowadays, at the hobby desk, I put different parts of my projects in different areas so I will be compelled to get up from the comfy leather office chair I got at Goodwill!
No naps, and no back pain, doing it that way!! LoL