Zac Efron's recent body transformation was the start of something new. In fact, in order to portray legendary wrestler Kevin Von Erich in The Iron Claw, the High School Musical alum channelled the athlete's dedication to achieve a toned physique fit for the ring. "He really motivated me to get in shape for this movie," Zac told Entertainment Tonight about the iconic athlete while attending the premiere in Dallas. "The physicality he brought to the ring every single day was really unique. It changed wrestling. I knew that was going to be the hardest [thing] for me to master and get right." But he rose to the challenge, noting, "I put everything I had into it." While Zac's hard work most certainly paid off – he also opened up about the beauty makeover he underwent to channel the famed wrestler. Zac and his costars – which includes Harris Dickinson and Jeremy Allen Whie – had to rock very '80s hairdos. And for Zac, that meant a shaggy bowl cut – which is no small feat! As he put it, "It was shocking at every point of the transformation."