Margaret "Maggie" Fitzgerald, a waitress from a Missouri town in the Ozarks, shows up in the Hit Pit, a run-down Los Angeles gym owned and operated by Frankie Dunn, an old, cantankerous boxing trainer. Maggie asks Frankie to train her, but he initially refuses. Maggie works out tirelessly each day in his gym, even after Frankie tells her she's "too old" to begin a boxing career at her age. Eddie "Scrap-Iron" Dupris, Frankie's friend and employee—and the film's narrator—encourages and helps her.