Few characters captivate audiences like the underdog sports hero, and “Strider” introduces a fresh figure to this esteemed cinematic category, continuing the legacy of films like “Rudy,” “Hoosiers,” and “Million Dollar Baby.” The story follows Jody (Yelena Friedman), a solitary teenage girl, who teams up with Hannah (Maggie Alexander), a track coach with a tarnished reputation. Together, they dedicate their summer to preparing for the Pinnacle Games, the premier track-and-field event on the East Coast.