I would love to tell you I've found the secret to eternal youth. I go to the gym and avoid too many chips. I love to eat, hate to work out, but if you can't count all your ribs from a distance you're considered obese.

I went off and read the books after the audition and I read all four books in one sitting - you know - didn't wash, didn't eat, drove around with them on the steering wheel like a lunatic. I suddenly understood why my friends, who I'd thought where slightly backward, had been so addicted to these children's books. They're like crack.

There is nothing nicer than playing someone who is cooler, tougher, more virtuous and sexier than yourself and thinking, 'I can be anyone.

I got into shape because I took kick-boxing lessons every day to prepare for a fight scene with Taylor Lautner. I really wanted to lie down and eat Chinese food, but I kick-boxed every morning and ran. If someone was filming you with your kit off, you'd do the same thing.

In fact my favourite thing is the wig because I'm a very lazy actor so every time I put it on, in order to keep it straight, they kept on telling me to tip my head back because otherwise I was eating it all the time.

It seems a bit weird to call someone your girlfriend when you have a child.

Look, I play all these tough guys and thugs and strong, complex characters. In real life, I am a cringing, neurotic Jewish mess. Can't I for once play that on stage?