Southpaw Jake Gyllenhaal
Southpaw required Jake Gyllenhaal to be in peak physical condition because he was playing a middleweight boxer. He trained at the same gym as Floyd Mayweather for six months, each day for six hours, to get into shape for the part. He devoted a great deal of time and effort to developing his physique, and the results gave him reason to be pleased with himself. Each and every one of his coworkers remarked on how determined he was. He changed his appearance for other roles as well. Since he was so dedicated to the role, Gyllenhaal and Alyssa Miller broke up.