Actress Amber Heard had to work out five hours every day for six months to prepare for her role as Mera, the daughter of King Nereus in the forthcoming film Aquaman.

"I did six months of rigorous training. It was a lot of weight and strength training, as well as special martial arts training. By the end, I was working out for five hours a day," Heard told Shape magazine.

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The actress makes sure her workouts are never an obligation.

"When I'm not preparing for a movie, I have more freedom, and I incorporate my workout into my life, so that I enjoy it and it does not feel like an obligation. I like running because it's a way for me to alleviate stress, clear my mind, and refocus.

"Plus, I can do it anywhere. I travel so much that it's invaluable to me to have something that keeps me healthy and feeling good no matter where I am," she said.