LONG BEFORE DIANA WOJSZNIS of Portland, Oregon, became an avid trail runner, she was a teenager with unexplained chronic pain. After years of suffering, at 28, she was diagnosed with a severe form of endometriosis, a condition in which tissue similar to the uterine lining grows elsewhere in the body. Her 30s were filled with doctors, ER visits, and several surgeries. She felt like her body was failing. To regain a sense of control over it, she prescribed herself daily walks. The simple act of mindful movement helped her cope, and soon walking became run/walking, then slow, continuous running. Within three months, Wojsznis signed up for the 2009 Portland Marathon, finishing it in under six hours. But while running did wonders for her mental state, it created another physical problem: It…
