Zac Efron admits why he was 'so uncomfortable and embarrassed' filming Iron Claw after he shocked fans with changing appearance

He's undergone a physically gruelling transformation for his new film Iron Claw. Yet aside for the demanding preparation and intense physical demands of the role, Zac Efron has revealed what he actually found the most uncomfortable part of filming as he detailed the painful and embarrassing moments. Zac Efron, 36, has admitted why he was 'so uncomfortable and embarrassed' filming Iron Claw after he shocked fans with his complete change of appearance for the role Speaking in an interview with Metro, the actor, 36, opened up about how he was uncomfortable in the wrestling ring and felt exposed during the awkward moments in between takes as he was left in his underwear While it was demanding taking part in the aggressive sport, Zac found the awkward moments in between takes harder as he revealed he felt rather exposed in his underwear. 'One of the jarring moments that I wasn't expecting was when the wrestling stops, or there's a cut, or in between setups or takes – you've just got to stand there with a whole crowd around, in your underwear. And there's nothing really going on' Zac previously admitted back in December that he found it difficult to meet with the role's physical demands after he transformed his body so much he was unrecognisable compared to when he first hit screens in High School Musical back in 2008 The wrestling drama, which was created by Sean Durkin, centres around the real-life story of the Von Erich wrestling family.