Over the past year, I spent an inordinate number of nights watching grainy livestreams of Taylor Swift's Eras Tour. The show is more than three hours long—it includes more than 40 songs—and by the end, I'm exhausted, despite doing nothing other than singing along. I've frequently wondered: How did Swift get in the type of shape to pull off the intensely choreographed, marathon-like show?

We now know the answer. Today, Swift was named TIME's 2023 Person of the Year, and in her first interview in four years, she revealed that she began training six months ahead of the tour's debut in March. “Every day I would run on the treadmill, singing the entire set list out loud,” she told TIME's Sam Lansky. “Fast for fast songs, and a jog or a fast walk for slow songs." Her gym created a program that incorporated strength, conditioning, and weights, and she spent three months working on dance routines as well. She also stopped drinking—noting that during past tours, she behaved "like a frat guy.”

Swift typically performs on Friday, Saturday, and Sunday nights. After a run of shows, she takes one day to rest and recover. “I do not leave my bed except to get food and take it back to my bed and eat it there,” she says. “It’s a dream scenario.” That dose of relaxation allows her to shake it off and return to the stage, yet again, mere days later.

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