This originally appeared on People.com. 

fully committed to her role as Mera in the , spending hours in the gym to fit the part.

“She wanted to deliver for the character,” , one of the multiple trainers Heard worked with during filming, tells PEOPLE.

Peterson trained Heard, 31, four to five times a week, “for a non-stop, no-breaks hour with me, and THEN she went to her fight training, which was rigorous!” he says.

They focused on full-body fitness, similar to what Peterson features in his , for Heard to fit the sea queen role — and to .

“Everything was athletically based. We trained movements, not muscles,” Peterson says. “Squat presses, sled work and lots of work in a rotational plane against resistance. She is a true athlete.”

A post shared by Amber Heard (@amberheard) on May 5, 2017 at 8:24am PDT

 

Peterson adds that their workouts were “unrelenting,” but Heard handled it with ease thanks to her dedication.

“She was so consistent,” he says. “Without her being so committed, the results would not have happened.”

And he says that Heard for getting the work done.

A post shared by Amber Heard (@amberheard) on Apr 1, 2017 at 10:56am PDT

“She could not have been better!” Peterson says. “If I could bottle her drive and conviction I’d sell that as a pre-workout drink!”

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