Impossible is a word that Shah Rukh Khan doesn't believe in.

But when it came to playing a superhero in his next film Ra.One, the superstar confesses that the film came to him just at the right time and he wouldn't have been able to do the kind of action it demands two years from now.

It is a known fact that 'Ra.One' was physically taxing for Shah Rukh who suffers from severe back problem. "I am 44 and trust me I got injured in places which I can't even mention. It's so tough on me physically.

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