Sydney Sweeney plays a former professional boxer in the biographical drama film and she has now taken to social media to passionately defend the project despite its failure at the box office.Sydney wrote on Instagram: "I am deeply proud of this film. Proud of the film David (Michod) made. Proud of the story we told. Proud to represent someone as strong and resilient as Christy Martin. This experience has been one of the greatest honors of my life.The star adds: "Yes, I'm proud. Why? Because we don't always make art for numbers, we do it for impact. And Christy has been the most impactful project of my life. Thank you Christy. I love you."