Studies have gone back and forth on the question for years – is a stroll as good as a run? Does a brisk walk strengthen your heart as much as a pounding jog?   Paul Williams of Lawrence Berkeley National Laboratory in California and Paul Thompson of Hartford Hospital in Connecticut think they’ve answered the question, finally. They did it in the best way possible, by comparing tens of thousands of runners to tens of thousands of walkers.   Click HERE to read the full article.