It turns out that I may have been preparing for my runs all wrong for all of these years (if you include my years of running back in the early 90's). The linked article suggests that pre-run stretching is unnecessary, and should be replaced by gradually increasing movement of your body, e.g., start with walking and work up to a slow jog over a period of several minutes. Save stretching for post-run (or during a run).
Q & A: Proper Warm Up and Foot Pain | Active.com
How do you prepare for a run?