Shannon Castle - Poway, Calif.
Sports: Triathlon, running
Profession: Medical student, University of California San Diego
How I got started in sports: I had been running for several years. When I got an overuse injury, I started swimming to keep in shape. My friend convinced me to buy a bike and do all three sports. My first race was the Carlsbad Triathlon in 2004, and I've been addicted since.
Favorite spot to be active: For running, Torrey Pines State Reserve in San Diego. For biking, the coast; the ocean is a great backdrop for any ride.
Life/sport philosophy: Triathlon won't taker over my life; it just helps me balance everything.
Athletic highlights: I ran my first marathon in January, the Carlsbad Marathon.
Athletic goals: Do a half Ironman and run the Boston Marathon.
Favorite fuel: I can't get enough oatmeal. It's great fuel for a morning workout, but I've eaten it for dinner, too.
When I'm not running, biking or swimming, I'm: Usually in the hospital working on my M.D. or spending time with my 8-year-old daughter, Regan. We like to hang out at the beach, explore museums and bike around the lake.
Other interesting facts: I'm a single mother trying to model a healthy, balanced lifestyle for my daughter. Professionally, I want to become a surgeon.