Weekend warriors: How 55-year-old sprinter Daphne Sluys became a world champion

Daphne Sluys is a math instructor at Western Washington University. She teaches undergrads about calculus and linear algebra, equations and applications, processes and results. She has a logical mind.

But it was leading her astray in her other life -- that of a world-class masters sprinter. She was training too much, and suffering injury after injury.

After yet another season of disappointment, Sluys, 55, hired Steve Kemp, a former Canadian Olympic trials decathlon champion, to coach her. He immediately told her to spend less time running.