Nicholas Galitzine and Camila Mendes Show Off Their Gym Gains for ‘Masters of the Universe’

Even after ‘Masters of the Universe‘ premiered in theaters, the training content continues to emerge. Camila Mendes recently shared a series of behind-the-scenes clips from the film on her Instagram, featuring a standout shot of her and co-star Nicholas Galitzine flexing together in the gym, which has captivated fans.

Galitzine stars as Prince Adam/He-Man in the live-action reboot, while Mendes plays Teela, the fierce Captain of the Guards of Eternia. To save his family and his world, Adam must team up with Teela and Duncan/Man-At-Arms, portrayed by Idris Elba, and embrace his destiny as the most powerful man in the universe. The gym photo clearly shows that both leads brought their warrior energy to life.

Galitzine trained with celebrity personal trainer David Kingsbury for six months to bulk up and build muscle for his role, impressing both fans and the film’s producers. Producer Jason Blumenthal praised Galitzine’s dedication, stating that he “fully committed” and that his transformation was “100-percent real,” achieved through hard work without shortcuts.

Galitzine himself revealed on Fandango’s Big Ticket podcast that he sometimes fasted for 18 hours before completing a three-hour weight-training session followed by stunt work, which he described as a true test of willpower.

Mendes began her training back in September 2024, months ahead of filming, and has shared how she and Galitzine formed a strong bond through their shared fitness journey, learning about their bodies and nutrition together in a meaningful way. In an interview with Refinery29, Mendes reflected on the months spent bulking up and training to meet the physical demands of Teela, focusing on strength conditioning, movement training, and combat choreography.

Mendes described the physical preparation period as the happiest time of her life, as she enjoyed going to work and practicing with a sword and bow staff. This infectious enthusiasm shines through in the behind-the-scenes clips she shared, including the now-viral double flex moment that has taken the internet by storm.

The film, directed by Travis Knight and produced by Mattel Studios and Escape Artists, has a budget ranging from 170 to 200 million dollars and runs for 141 minutes. It was released in theaters on June 5, with Amazon MGM Studios handling domestic distribution and Sony Pictures Releasing managing international markets. The impressive cast also features Jared Leto as Skeletor, Alison Brie as Evil-Lyn, and Morena Baccarin as The Sorceress.

Early reviews have been more positive than anticipated, with critics from Screen Rant and Mashable calling it a delightful surprise, and the film boasting an 87 percent audience score on Rotten Tomatoes. If the gym selfie of Galitzine and Mendes is any indication, the chemistry and commitment that made the movie successful clearly continued off-camera.

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