Jake Gyllenhaal is the latest actor to join the long list of committed professionals who have undergone stunning body transformations to prepare for a specific role. Like Christian Bale, who after losing jaw dropping 60 pounds for ‘The Machinist’ went on to pack 40 pounds of muscle for ‘Batman Begins,’ Jake has also worked incredibly hard to get a muscular body after shedding 30 pounds for the crime thriller ‘Nightcrawler.’

As revealed by his trainer Terry Claybon (former professional boxer) in an interview with Yahoo, Jake worked like a pro athlete for six months to prepare for the role of a boxer, who battles his demons and destructive behavior to return to the pinnacle of the sport. The 34 year old star spent incredible six hours a day in the gym to develop a physique that would put many professional athletes to shame.

What makes his transformation even more stunning is the fact that Jake looked particularly lean as a freelance crime reporter Lou in ‘Nightcrawler,’ who comes across the dark underbelly of the Los Angeles underworld. To get the trademark ripped torso of the boxer, he used to do 2,000 sit ups a day, 1,000 in the morning and another 1,000 at night.

Jake Gyllenhaal in the boxing ring.