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Maria Pontillo, 27, Fort Lauderdale, Florida
For Maria, working out isn't about looking good. "I eat right and exercise not just for myself, but to have energy to care for others," says the physical therapist, who moonlights as an aerobics instructor and personal trainer.
Top tip: "Motivate with a mantra. I have several that I repeat during races; I've completed ten 5Ks and five duathlons. My favorite is a take on something Lance Armstrong said: 'Pain is temporary; quitting is permanent.'"