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Few prognasticators expected Abdi Abdirahman to make the 2012 U.S. Olympic marathon team. Now the Arizona son is striding towards his fourth Games -- and he has no plans to stop after London.

Though a top-three finish in Saturday's Olympic marathon trials would earn Deena Kastor a spot in her fourth Games, the 38-year-old new mom is aiming higher.

Not every elite distance runner in New York is racing the marathon this weekend. Several top Americans saving their best 26.2-mile effort for January's Olympic trials are racing a 5K on Saturday instead.

Injury-free, gluten-free and pain-free, the pro distance runner explains how finding the right doctor, location, coach and teammates made all the difference in striving toward her Olympic goals.