
Certain old men prefer to rise at dawn, taking a cold bath and a long
walk with an empty stomach and otherwise mortifying the flesh.  They
then point with pride to these practices as the cause of their sturdy
health and ripe years; the truth being that they are hearty and old,
not because of their habits, but in spite of them.  The reason we find
only robust persons doing this thing is that it has killed all the
others who have tried it.
		-- Ambrose Bierce, "The Devil's Dictionary"
