'Dear Peter Jackson and Guillermo del Toro. If you should need a Ranger or other human hero for The Hobbit, please consider this my audition tape. Cheers, Jake Gyllenhaal.'

Bruckheimer explains Jake's routine: "He really worked hard. He worked for months and months before the movie started. He trained every single day. He rode bikes, he lifted weights, he had a very specific diet. He couldn't have any fats, and it was really a lot of protein, and all during filming, he was working in 120 degree heat.

"Jordan said he saw him, after a long day, around 7 at night taking a jog, running, so he kept it up through the whole movie."