Would a stressed out Amazon/Uber eats delivery person who is very fit from working 10 hours a day, but with barely enough money to feed their family going to be less angry/anxious than a rich person lounging at his villa with zero worries? This is looking at one variable which isn't very useful.
working != working out
if you don't believe me, take one look at a construction site and the workers on it.
> This is looking at one variable which isn't very useful.
It’s a core part of the scientific process: “All else being equal…”