Margaret “Maggie” Fitzgerald, a waitress from a Missouri town in the Ozarks, shows up in the Hit Pit, a run-down Los Angeles gym which is owned and operated by Frankie Dunn, a brilliant but only marginally successful boxing trainer. Maggie asks Dunn to train her, but he angrily responds that he “doesn’t train girls.”
Maggie attempts to win Frankie over by working out tirelessly each day in his gym, even when others discourage her. Eddie “Scrap-Iron” Dupris, Frankie’s friend and employee, encourages and helps her all he can….