I can't really do the running on hard ground that I used to do. Instead I go swimming as often as possible.

There's very exciting directors who haven't made a feature yet. That's what's cool about the job - the ever-changing landscape of people you could potentially work with.

I'd known plenty of people who'd worked with Cillian [Murphy], and he was one of those people I'd only heard good things about. It's pleasing when it works like this. As Cillian said, it's not always like that.

I've always needed to bulk up, so until the modeling took off I was ramming Big Macs down my throat and doing plenty of bodyweight work. I'm over the Big Macs now, but I'll still drop down and do my press ups whenever I find the time.

Everyone likes a bit of competition.

It's funny when you know you're playing two characters and you're aware of how you have to play each one into your performance of the other. You're constantly at the back of your mind thinking and it all gets a bit confusing.

Most of the crew were staying in Monaco. But my family and I were actually staying in Nice because I had my whole family there and we wanted a little more space and to stay in a hotel. The truth is we were asleep [when the attack Bastille Day terror happened] and woke up the next morning to it and it was obviously horrific. And then the idea of going out and filming, it just felt so stupid to be working the next day and pretending that everything's cool when you're making some frivolous thing.