You do have some choice on a construction site. Physical activity depletes nutrients. You can choose to replenish them. Strength and obesity is also a choice.
I once had a coworker 24 years old but he barely ate and barely slept. In a few years he has injuries everywhere that didn't go away.
One guy I know fell down 10 meters onto his back then got up and went back to work. He looks exactly like someone like that.
I've met a surprising number of manual laborers who seemed to believe you can build or repair something without materials.
Much like office workers who think ergonomics is something that comes after ruining your body.
This doesn't even look real