Moderation in all things seems to be the motto for everything lately, and it includes exercise. No need to run fast or far; your few miles of jogging is doing you a world of good.
From The New York Times:
PHYS ED: Moderation as the Sweet Spot for Exercise
PHYS ED: Moderation as the Sweet Spot for Exercise (NY Times) was last modified: June 12th, 2012 by