You're in incredibly fine condition, the doctor concluded after finishing a thorough physical. "How old did you say you were, sir?" "Seventy-eight." "Seventy-eight! Why, you have the health of a sixty-year-old. What's your secret?" "I guess, Doc, it's due to a pact the wife and I made when we got married. She promised that if she was ever about to lose her temper, she'd stay in the kitchen 'till she cooled off. And I pledged that when I got angry I'd keep quiet, too, and go outside until I calmed down."
"I don't understand," said the doctor, "How could that help you stay so fit?" "Well, the patient explained, "I guess you could say I've lived an outdoor life."