Callie Cowan, 29, Venice, Florida
When she started her blog, Callie couldn't run a mile. Now this mother of one (soon to be two!) is a regular racer and has completed half-marathons and a sprint triathlon. "It's amazing to see how far I've come," she says.
Busy mom must-do: "As a working mother, sometimes I feel guilty for squeezing in a workout. But then I remember that taking care of myself makes me a better mom."
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