“I’ve noticed,” Mom said, “ever since you got your paper route, you haven’t been sick.” Having a paper route in the middle of the last century meant delivering papers to people’s homes seven days a week, 365 days a year in rain, snow, summer dog days, and excellent weathers.  It meant, in my case, exercising hard for 45 minutes up to an hour and a half on snowy Sunday mornings in the dark. “Where have I heard this before?” you inquire politely. “That’s right – Younger Next Year and Harry’s rules.  The first rule is exercise hard six days a …