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For more than a decade, Katie Arnold chased adventure around the world, reporting on extreme athletes who performed outlandish feats - walking high lines 1,000 feet off the ground without a harness, or running 100 miles through the night. She wrote her stories by living them, until eventually life on the thin edge of risk began to seem normal. After she married, Katie and her husband vowed to raise their daughters to be adventurous, too, in the mountains and canyons of New Mexico. But when her father died of cancer, she was forced to confront her own mortality.

Deena Kastor was a star youth runner with tremendous promise, yet her career almost ended after college, when her competitive method - run as hard as possible, for fear of losing - fostered a frustration and negativity and brought her to the brink of burnout. On the verge of quitting, she took a chance and moved to the high altitudes of Alamosa, Colorado, where legendary coach Joe Vigil had started the first professional distance-running team. There she encountered the idea that would transform her running career: the notion that changing her thinking - shaping her mind to be more encouraging, kind, and resilient - could make her faster than she’d ever imagined possible.