Dave Griffin has been writing a bi-weekly running column since 2006. He coordinates the Flying Feet Running Program in Westminster and is the author of "After the Last PR - The Virtues of Living a Runner's Life."
In my heart, I am a competitor, and a person's heart is slow to change. I'm 55, and about to take another break from running. My right calve seizes after less than a mile, and once it does, I'm left to finish with a limping walk.