LOS ANGELES-Christian Bale has admitted he thinks he is ‘’invincible’’ when it comes to his constant dramatic weight change for movie roles. Christian Bale believes it his obsession with his art form that makes him a great actor. The 43-year-old British star is known for his total commitment to his roles and is prepared to do anything to bring his characters to life. For his portrayal of insomniac Trevor Reznik in ‘The Machinist’ he lost 62 pounds reducing his body mass to just 120 pounds, whilst for his acclaimed performances as Batman in ‘The Dark Knight’ trilogy he built up his muscle and physique to be the Gotham City saviour. For his next role as former US Vice President Dick Cheney in Adam McKay’s upcoming biopic ‘Backseat’ he has gained a significant amount of weight. Bale doesn’t worry about the long-term effects his body transformations have on him because he feels as though he’s ‘’invincible’’ and he believes it is his total commitment to his work which allows him to give such memorable performances. Speaking to the Metro newspaper, he said: ‘’I keep thinking I’m invincible. I like obsession. I hope that it stays as healthy obsession. ‘’There’s just always been an image which struck me incredibly. Jimi Hendrix playing guitar, eyes closed, looking like he’s in ecstasy, creating beautiful music ... and I don’t know if I imagined the blood or not but blood flowing from his fingers.