It's a hard job but he sounds like he's exaggerating.
manual labor is for college kids and unskilled young adults.
you dont time the energy in your 30s for that shyt
A guy came to one of my jobs with his back already messed up from working at either FedEx or UPS.
Guy was in his 20s and couldn't last 4 hours on the job. Quit the same day he started.

man i kinda want a job at the post office... id have to give up weed tho right?USPS is nothing like UPS/FedEx