Zac Efron, Jeremy Allen White and Stanley Simons sit down with “Extra’s” Terri Seymour to talk about their new wrestling movie “Iron Claw,” which is about the famous Von Erich brothers. Zac and Jeremy speak about their incredible physical transformations and how they bonded by getting in the ring together. Plus, Stanley dishes on a fun moment when he busted out a “High School Musical” song for Zac on set! “Iron Claw” is out December 22.