Waitress Regina Baff would do anything to escape her go-nowhere existence. And by "anything", that means she'd be willing to risk life and limb in the wrestling ring, disguised as "The Mexican Spitfire" (never mind that she's Polish). Trained by veteran lady wrestler Mildred Burke (playing herself), Baff seeks fame and fortune on the Midwest grappling circuit, finding neither but having a high old time in the process. Based on Rosalyn Drexler's novel To Smithereens, Below the Belt was mostly filmed in 1974, but not released until after the Rocky pictures took hold.
~ Hal Erickson, All Movie Guide