Yea don’t underestimate the impact of youthfulness here. I’d be willing to bet that the same work you do now wouldn’t have the same impact it does today.

Though I will say, working in UPS facility during college definitely left me exhausted most days. I was an athlete in good shape, but it was still a very taxing job. Kept me in good shape though, which certainly helped stave off any of the psychological impact of a sedentary office job due to physiological changes in my body.