also stars True Detective's
Rachel McAdams, Naomie Harris, Rita Ora, Victor Ortiz, Forest Whitaker and 50 Cent. Antoine Fuqua (Training Day
) directs the drama and told Deadline
he was quite impressed with Gyllenhaal's performance.
"Jake is going to change how people see him. I had him training twice a day in the boxing ring, he did two-a-days seven days a week," he revealed. "I pretty much had him with me and my trainer every day. I took him to almost every fight. I had him train at Floyd Mayweather’s gym in Vegas and we watched Floyd’s fights, and the Manny Pacquiao fight. He trained in New York at Church Gym with real fighters. We literally turned him into a beast."