The American actor - who plays the role of Prince Dastan in new movie `Prince of Persia: The Sands of Time` - admitted getting into shape might have been tough, but faking the British accent was even more demanding.

He told BANG Showbiz: "The accent definitely. It`s daunting trying to do any kind of service as an American to such a beautiful, fluid speech pattern that you all have. We are just barbarians in comparison."

The 29-year-old heartthrob - who stars alongside Gemma Arterton in the action adventure movie - claimed it was only through the persistence of director Mike Newell that he managed to pull it off.

He said: "It did help being surrounded by an international crew, but a primarily British cast and somewhat British crew. So I would speak, as soon as I got out of the car, I would speak with the accent all day and journey from region to region around England as I spoke to different people.

"Sometimes I would sound like them in takes and the director Mike Newell would shout, ?Dear boy, that doesn`t sound right, do it again!`. I would say the accent was the hardest part to manage."

Jake has previously spoken about how the role was such a challenge because he needed to be in perfect physical condition.

He said: "I never did anything this intensive before to change my body. It`s a physical role. And when I commit to playing a part, it`s 110 per cent."
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