The doctor examined his patient's tongue, felt his pulse, and tapped his chest. "Same old story, my friend. Too much confinement. Don't deny it. What you need is plenty of outdoor exercise. Walk. Walk."
"But, doctor..."
"Don't argue with me. I am the doctor. Take my advice. Walk ten times as much as you do now. That's the only thing that will cure you."
"But my business..."
"That's just the trouble. Your business! Well, change your business so you can get a chance to walk more. What is your business?"
"I'm a letter-carrier."