Actor Dwayne Johnson played the role of Hercules in this summer’s blockbuster movie, and revealed he had to get into even bigger shape for the role.

Johnson posted the details of the aptly named “12 Labors Diet” on his Instagram page, and said he followed the diet “full on” for 22 weeks.

“It’s about getting enough protein to aid lean muscle growth, and everything is very precisely measured depending on what targets I’m looking to hit for that day,” Johnson said. “Lots of protein, good carbs, and veggies. Nutrition is so important, it can’t be stressed enough.”

“It was all about hard work, discipline, and balance,” he explained. “I had carbs with every meal, so there was always a balance of proteins, carbohydrates, and fats. Then part of my daily regime was my glucosamine and then also a multitude of multivitamins. Then I had glutamine, branched-chain amino acids, chondroitin, and one protein shake a day, which I drank after training.”