Astonishing life of female boxer who inspired new Sydney Sweeney movie

has swapped her glamorous image for a tough new look as she shoots her new movie Black Bear.

The star revealed a dowdy brown hairstyle and comfort-wear outfit for her role as trailblazing boxer Christy Salters-Martin in director David Michod's upcoming biopic.

Christy's remarkable story is as incredible as any of the heroines Sweeney has played.

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