Here's how to decide if you're cut out for ups hub work:
Put on jeans, a sweatshirt and work boots. Wait til it's about 90+ degrees outside, then go into your attic and do lunges and squats for 3-5 hours. Make decision.
Here's how to decide if you're cut out to be a driver:
Dress in shorts and shirt. Drive to anywhere and park in the sun with windows rolled up. Wait til inside car temp reaches 130+ degrees. Crawl from front seat and claw your way into the trunk by any means necessary. Kick open trunk and sprint 40 yards. Return to car, drive 1/4 mile, repeat 200x's. Make decision.
Now here's the kicker. If all of this sucks, but you're a pretentious, condescending shell of a human, AND you're easily mind washed and manipulated, AND believe you can insist others do these things which you're too much of a sissy to do, then forget the union work, you're ready to go straight to supervision! Congrats.