My various running and academic mentors -- co-bloggers included -- might argue otherwise. But a dour article on p. D6 of today's WSJ counsels that after age 50 running fast and far may be more stress than benefit. Running some is apparently a good thing. But running too hard apparently makes you age more quickly and overstresses the heart. One more source teaching "moderation, moderation."
As I stand here it's still drowned out by the Highlander theme song by Queen and the lure of a marathon starting line