Zac Efron surprised by muscular physique

London: ‘High School Musical’ star Zac Efron says he didn`t recognise himself after putting on 18lbs of muscle to play a war veteran in his new movie. The 24-year-old actor bulked up to play a war veteran in ‘The Lucky One’ and said he was impressed with his own willpower, a website has reported. "By the end of the movie I didn`t recognise myself. You hear about guys like Christian Bale who dive into it and are really able to transform. I`ve always wondered if I had the willpower to actually do it. And I`ll always have pride around the sense that I can," he said. Although the actor said he doesn`t have any special talents, he thinks his willingness to work hard has played a huge part in his successful career. "I could pick up almost anything. If you put it in front of me, I could always find a way to tackle it. [While training for `The Lucky One`} I`d get this strange sense of power as those weights increased. I was never a natural at anything, but I could always outwork everybody." PTI