Mary Cain is an American writer and athlete best known for her memoir "This Is Not About Running." Once hailed as one of the most talented young distance runners in the United States, Cain became a prominent voice in conversations surrounding athlete mental health, body image, and the pressures of elite sports culture. Her candid storytelling draws on her own experiences navigating a high-performance athletic world, resonating deeply with readers far beyond the running community. Through her writing, Cain continues to inspire a generation of young athletes to prioritize their well-being above all else.