Most of Prizefighter was shot at Gleason’s Gym. The gym has a long history and influence in NYC boxing. Gleason’s Gym also has an extensive network and run-ins with celebrities/the film world (ex. Hilary Swank trained there for the film, Million Dollar Baby).
Check it out at: http://www.gleasonsgym.net/
PS. You can visit there and get boxing/kickboxing/a hell of a workout with Heather and her coach, Devon McCormack!