Filming in Vancouver, Canada, the actor viewed the magnificent Grouse Mountain daily and when he heard Jackman had set a celebrity record for scrambling to the top while making X Men Origins: Wolverine he felt he had to have a crack.
Cooper says, "Hugh Jackman did it in 35 minutes... It's two-and-a-half miles at a 45-degree incline... It was pretty crazy... I did it in 28 minutes.
"The first time I did it, it was, like, six in the morning and I had my headphones on; I thought, 'I'm killing this'. All of a sudden... this woman, maybe 53 years old... just flies right past me."
Liam Neeson cheered his castmate on: "His girlfriend told me he went up like a jackrabbit."