I made supervisor, and now I answer for the routes and the complaints that come in all day. The hard part is my old crew, the guys I rode with, and I'm the one pushing them on a pace I know is hard on their backs and knees. I used to be beside them; now I'm the voice telling them to go faster.
More people experience this than they realize.
You push your old crew on a pace you know is hard on their bodies.
If this sounds familiar, the Library can help you find the bigger picture.