The free fight that appears in the film is called MMA in the United States, which is the abbreviation of Mixed Martial Arts. Because the movement is so brutal, it's a niche movement even in the United States.
Athletes compete in iron cages, so this sport is also called "cage fighting". Director Gavin O'Connor believes that MMA is an element and has seen it in many action movies, so he presented this kind of competition in the movie. And this kind of men's sport is only loved by tough guys and real men who are unyielding in the face of life. Combined with the fact that the film tells another story between three men, MMA fits the tone of the whole movie better.
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