When Gina Rouse graduated as a nurse from the University of Tennessee-Chattanooga in 2003, she intended to keep training like she did as a college runner. “I got the night shift in my first job as a nurse,” Rouse, who now lives in Knoxville, Tennessee, told Runner’s World. “I was working from 7 p.m. to 7 a.m., and still trying to run twice a day before and after the shift. I definitely cut corners on sleep.” Rouse soon realized that her new schedule made it impossible to keep training the way she did in college. So throughout most of her...