‘The Iron Claw’: Zac Efron Dishes on How This 'High School Musical' Song Helped on Set (Exclusive)

'The Iron Claw's Zac Efron, Jeremy Allen White, Harris Dickinson and Stanley Simons chat with ET’s Cassie DiLaura about their highly anticipated film which is based on the true story of the Von Erich family, who made history in the world of professional wrestling in the early 1980s. The cast members open up about what it was like getting their bodies shaved together for the film and learning wrestling moves. Zac, who portrays Kevin Von Erich in the movie, also opens up about how the 'High School Musical’ song, 'Breaking Free,' helped him on set. 'The Iron Claw' slams into theaters on Dec. 22.