It's true that physical labor can cause injury that can hunt you later in life. But also:

> Sedentary lifestyles increase all causes of mortality, double the risk of cardiovascular diseases, diabetes, and obesity, and increase the risks of colon cancer, high blood pressure, osteoporosis, lipid disorders, depression and anxiety.

So I'm not sure desk jobs are any better. They just create less obvious problems, where a shoulder pain from an old shoulder injury is easy to trace back to the cause, desk job injury caused from sedentary life style are hard to trace back but could be worse.

Also, I'm talking about a bit of a different problem, which is not how it leaves you later in life, but how it makes you feel when the day is over. Feeling physically tired can almost be nice, you take a bath and it feels so good. And when you go to sleep you have this nice deep restorative sleep from the physical exhaustion. Your brain isn't tied up with work. And all that.