Zac Efron BULKS UP for Iron Claw, looks unrecognizable

Zac Efron got pretty jacked.

The Greatest Beer Run Ever star, 35, was captured on camera on the The Iron Claw set in Louisiana on Monday. Efron checked his phone while standing shirtless with a towel wrapped around his waste. He had a noticeable new hairstyle.

Efron portrays professional wrestler Kevin Von Erich in A24's Iron Claw. The movie, which is based on a true story, follows "rise and fall of the Von Erich family, a dynasty of wrestlers who made a huge impact on the sport from the 1960s to the present day."

The movie also features Lily James, Maura Tierney, Jeremy Allen White, and Harris Dickinson and was written and directed by Martha Marcy May Marlene director Sean Durkin.

In a recent interview with Men's Health, Efron discussed his experience training for the role and how he decided to approach it differently than he did for the 2017 film Baywatch.

After recovering from the intensive training for that project, he claimed he "fell into a pretty bad depression, for a long time".