Every day doctors save and improve people’s lives. But how often does a patient get the chance to return the favor? Enter 28-year-old Greg O’Keefe of Arlington, Virginia and his 41-year-old heart surgeon, Allan Stewart. Together, they have become triathletes. Their story is the focus of this “My Story” edition of Endurance Planet, done in conjunction with USA Triathlon and brought to you by The Right Stuff electrolyte drink-additive.