SW: I had to stop working for about seven months. Boredom set in, and I started walking. At the time, I was fairly out of shape. The walks progressed to short runs of about a kilometer. I noticed when my blood started pumping the symptoms (numbness) seemed to become milder. The short distances started rolling into longer ones and then I thought I should try a half marathon. I started training and made it happen. I've run in three since 2009.