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According to Turner's personal trainer, James Farmer, one of Turner's first changes was switching up her morning routine.
"When I met Sophie, she didn't eat breakfast, which is a common mistake," he told SELF. "And I didn't think she was eating enough of the right foods. So I made sure she had a good source of protein and healthy fats with every meal, plus lots of fibrous vegetables like spinach and cauliflower."
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The diet Farmer created was a 'low-carb, Paleo-style plan,' which called on fruits, vegetables, lean meats and nuts.
"I've really embraced healthy eating," Turner said of the diet. "It makes you feel a lot better and more energetic. I'm inspired to get up and out."
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As for the preparation for her "unforgiving costume," Turner did "60 minutes of exercise six times a week for 3 months."
"Exercise has made me feel more positive about my body, less self-conscious," said Turner, "I don't know if I look any different, but I feel stronger, and I can do more, which is such a good feeling. It's so liberating."
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As per his interview, Farmer constructed full body workouts for Turner, which consisted of "hill sprints, kettlebells, resistance bands, and burpees" among other things.
Instead of training inside a gym, Turner notes that Farmer did everything outside on the streets of London. "It was all outside, around London, which was more fun than being cooped up in a gym," she said.
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Aside from strict regimes, Turner is also naturally active. The actress is often spotted skiing, biking and hiking with her fiancé, Joe Jonas.
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She's also a fan of using her own stream to get about, whether it's walking or biking.