A very good explanation, thank you. I didn't think there was a hidden meaning, just wasn't sure what you meant. I will say that I think you left out a category

A very good explanation, thank you. I didn't think there was a hidden meaning, just wasn't sure what you meant. I will say that I think you left out a category though. You covered physically & emotionally difficult jobs, but not cognitively difficult jobs. Some jobs will always keep a person on the edge of their mental capabilities, despite being office-bound.