Sure, but sedentary labor destroys the body through neglect—which is ultimately a choice.
Huh? It's not clear to me what you're trying to say here.
10 years in you should be a foreman or something is wrong.
There's also a lot of owner/operator one-man shops.
Also 1 foreman in the electrical field runs effectively 50 guys max if good, and smaller sites might be 10 men to a foreman. I currently have 3 foreman running 5 to 6 guys each at my current company (2 close sites of 3)