Almost half of the people in the U.S. do not meet the recommended amount of aerobic activity per week, so when I recently spent a week in South Beach, I was impressed at the number of people jogging outside in the balmy weather. Unfortunately, many joggers are hardly specimens of optimal health and remain so after many years of effort. Sadly, often running by itself proves to be little more than a waste of time, with zero results and increased injury rates. I want to muse a little on why that may be.

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