Eighty-six-year-old Joy Johnson, a veteran of 25 New York City marathons, died with her running shoes on. Johnson, who was the oldest runner in the 2013 marathon, fell at the 20-mile marker in the event. But she got up again, and she crossed the finish line in about eight hours. After the race she returned to her hotel room, lay down with her shoes on, and never woke up. Here’s the real kicker: Johnson didn’t run her first marathon until she was sixty-one years old. Ironically, Johnson was a career gym teacher, but a stranger to personal exercise until she took a three-mile walk in 1986. Then she started jogging and competing in 10-K races. By 1988 she had competed in her first New York City Marathon. Three years later she recorded her best time at age sixty-four: 3 hours and 55 minutes. After being a runner for a while, Johnson established a daily routine. She would wake up at 4 am, drink her coffee while reading her Bible, and then set out on an eight-mile pre-dawn run. “When you wak...