March 9, 2016 5:50 PM EST

Zac Efron has been busy getting in the best shape of his life to shoot the Baywatch movie and now he’s letting fans in on his secrets. The 28-year-old actor has begun sharing photos of both his workouts and new ripped body on Instagram.

Known fitness fanatic Dwayne “The Rock” Johnson has even posted about his co-star’s progress.

Efron also tweeted about the strict diet he has followed throughout his training. “[Nine] days of absolutely zero carbs & sugar. Only organic grass fed/free range protein and organic leafy greens,” he wrote.

However, he revealed that he does indulge in a cheat day every now and then.

This isn’t the first time the High School Musical alum has bulked up for a role. Back in 2012, Efron played an ex-Marine in The Lucky One and put on 18 pounds of muscle for filming.

Write to Megan McCluskey at megan.mccluskey@time.com.

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