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

He underwent a physically grueling transformation for his new film Iron Claw.

Aside from the demanding preparation and intense physical demands of the role, Zac Efron revealed what he actually found the most uncomfortable part of filming, detailing the painful and embarrassing moments.

Created by Sean Durkin, the wrestling drama centers around the true story of the Von Erich wrestling family.

The movie will depict the meteoric rise of the Texan brothers, Kevin (Zac Efron) and David (Harris Dickinson), and Kerry (Jeremy Allen White).

Talk in an interview with Subwaythe actor, 36, opened up about how he found the wrestling ring an uncomfortable place to be and found himself dealing with embarrassing moments he hadn’t experienced before.

Zac Efron, 36, has admitted why he was 'so uncomfortable and embarrassed' filming Iron Claw after shocking fans with his complete makeover for the role

Zac Efron, 36, has admitted why he was ‘so uncomfortable and embarrassed’ filming Iron Claw after shocking fans with his complete makeover for the role

The actor, 36, spoke in an interview with Metro about how he was uncomfortable in the wrestling ring and felt exposed during the awkward moments between takes as he was left in his underwear.

The actor, 36, spoke in an interview with Metro about how he was uncomfortable in the wrestling ring and felt exposed during the awkward moments between takes as he was left in his underwear.

While taking part in the aggressive sport was demanding, Zac found the awkward moments in between to be more difficult as he revealed he felt quite exposed in his underwear.

“One of the scary moments I didn’t expect was when the wrestling stops, or there’s a cut, or between sets or takes – you just have to stand there with a whole crowd around, in your underwear. And there’s really nothing going on.

‘It’s a different kind of feeling. I’ve never experienced that one.’

“You just kind of have to… like, where do you put your hands? On your hips? You can’t help it – there are people everywhere, you can’t look up and have someone not look back at you! So it was a bit unnatural.’

Still, the star admitted that he eventually got used to it and believes you should get uncomfortable when learning something new.

It comes after Zac previously admitted in December that he found it difficult to meet the role’s physical demands.

In an interview with USA TodayZac admitted he had no idea how real men managed to be so successful in the sport.

He said: ‘You think you’re getting the hang of it, and you accelerate a few times and your confidence builds.

“One of the scary moments I didn’t expect was when the wrestling stops, or there’s a cut, or between sets or takes – you just have to stand there with a whole crowd around, in your underwear. And it really doesn’t matter’

Zac previously admitted in December that he found it difficult to meet the role's physical demands after transforming his body for the role.

Zac starred as Troy Bolton in High School Musical in 2008

Zac previously admitted in December that he found it difficult to meet the physical demands of the role after changing his body to the point where he was unrecognizable compared to when he first appeared on screen in 2008’s High School Musical has.

Created by Sean Durkin, the wrestling drama centers around the true story of the Von Erich wrestling family.  Zac plays Kevin (pictured)

Created by Sean Durkin, the wrestling drama centers around the true story of the Von Erich wrestling family. Zac plays Kevin (pictured)

The movie also stars Jeremy Allen White (left), Harris Dickinson (right) and Brian Roedel

The movie also stars Jeremy Allen White (left), Harris Dickinson (right) and Brian Roedel

‘Then you hit one of those things just an inch too high and your rib is gone. You can’t breathe for a few days.’

He admitted the first time he tried the sport was ‘shocking’ as it wasn’t as ‘easy’ as it looked on TV.

Many of the wrestling matches featured in the film were recreations of the Von Erichs’ best against several of their rivals, Harley Race, Rice Flair and the Fabulous Freebirds.

The physical transformation into the wrestling forwards has been challenging for all three actors, with Dickinson describing it as difficult and Zac saying it was “quite boring” to drag himself into the gym every day.

Jeremy said his least favorite aspect of their exercise routine was eating every two hours.

But it wasn’t all challenging, as The 17 Again star compared wrestling practice itself to a ‘fun camp with your best bros’.

He said there was a ‘team element’ to the sport and learning a new skill allowed him to use different parts of his brain.