Or stairs in buildings. I don't want my coworkers judging how out of shape I am.

I can relate to this especially this past week visiting Yellowstone National Park. I climb a category 2 mountain and felt like I was dying when I reached the top. But dam it was worth it.

I also try to breath normally and silently when bypassing someone while jogging, just before I am dying from lack of oxygen and failing back into panting.