Jake Gyllenhaal crossed all physical boundaries to become Billy Hope

The 34-year-old actor went through rigorous training to prepare to play Billy Hope, a boxing champion, attempting to get his life back on track.

Terry Claybon,former boxer who trained the "Brokeback Mountain" actor for his role has revealed the actor crossed all physical boundaries to become Billy Hope and after the release of the film he will become one of the "biggest stars", reported E!online.

"I think that after this movie Jake's about to be one of the biggest stars out there, because of the strength. He's grown a lot. To pull off this boxing movie, he had to put everything into it. He had to put his heart and soul into this," Claybon said.

Even though, the "Nightcrawler" star looks perfect in the skin of a boxer, the actor was not at all in shape when he initially met the trainer.

"He wasn't in any shape at all," Claybon said. "We met at a boxing gym, and he was jumping rope. Just the way he was jumping rope, I knew we had a lot of work to do.Everything we did in training was as if he was having a professional boxing match," he said.

"Gyllenhaal didn't have any days off, training seven days a week for six months. "We were working out three hours in the a.m., three hours in the p.m., six hours total a day, seven days a week," he added.