Zac Efron's dramatic transformation for his role ... Breaking his silence, Zac is already back to his fitness regime.

The Season 3 standout says fitness helped his mental health as much as his physical well-being during his time on the reality show.

Zac Efron stole our hearts when he burst onto the scene in High School Musical, thus beginning a long and storied career in the spotlight. Not only is Zac fitness-obsessed and wildly talented ...