In college, when I worked as a cook at Waffle House, I'd frequently do double-shifts, 16-hour days standing. But it's a lot of movement, you're constantly moving from the food stock to the griddle.

My father is on his feet all day. He delivers bread to grocery stores. He is constantly speed-walking. He usually has about a 10 minute drive between stores, where he of course sits in his truck, and spends about 45 minutes in each store.

Now that I work from home, sometimes I take a shower to think. That's only tangentially related.