Work at a safe pace and watch for what is causing your pain. I noticed my knees would ache if i went down the stairs too fast. Now i go a bit slower and have no pain.
So this really stood out to me, because recently I realized the DIAD 6 is forcing me to go excruciatingly slow when I pull up to a stop in the country or deep in the woods. Stop the car, grab the DIAD and... frozen. So now I have to wait about a minute and a half to restart and get back to the login screen, and then another minute or so for the delivery app to fully load. It's really not much time at all, to be honest, but when you have to do it 80 times a day those minutes really start to add up.
It's the most irritating thing, but the bright side? I communicate every time the DIAD acts up on me, and my Saturday route has slowly gone from ~180 stops to about 110 with the same amount of miles.
I've also noticed that I come home with
so much energy now. It's weird, man, but like MECH-LIFT said earlier in the thread: Make UPS work for you. Work through the obstacles that the company puts in your way but don't ever panic and feel like it's your problem, because at the end of the day it almost never is. Fair day's work for a fair day's pay.