"Age Group Winner" documents Jay Helgerson's remarkable 1980 feat of completing a marathon each week for a year, consistently finishing in under three hours. The film explores his relentless drive through the lens of his daughter, Alexandra, who seeks to understand him. As Jay prepares for the Boston Marathon, battling physical and emotional challenges, the documentary intertwines Alexandra's own struggles with a serious illness that threatens to end the project. Ultimately, it’s an inspiring story about the human spirit’s resilience.