Disney actor now has rippling muscles

Zac Efron has been pumping iron in the gym.

The High School Musical star showed off his bulging muscles as he left a gym in Burbank, California last week.

Zac, 20, plays Troy Bolton in High School Musical 3: Senior Year, due to be released in October.

He is dating his co-star Vanessa Hudgens, 19.

SEE PICS Zav Efron’s toned body>>

SEE PICS Zac Efron and Vanessa Hudgens’ love story in pictures>>

SEE VIDEO Sneak preview of High School Musical 3: Senior Year

Sarah Goodall