Inspired by its hit series "Limitless: Live Better Now" with Chris Hemsworth, National Geographic turned to some legendary athletes to talk about the fitness and wellness habits they've learned later in life.

In 1976, a 14-year-old Nadia Com ă neci was the first Olympic gymnast to score a perfect 10. She did it six more times over the course of her career. Now, at the age of 63, she has figured out a fitness routine that works for her.

"I think life happens in phases. When you're a teenager and young, I mean, you're just busy with, you know, you don't worry about the years. Once you retire and you get hit by the, you know regular life, you realize that if you stop moving, then things go south very fast," she told National Geographic. "I do, you know like, 10-15 minutes of bicycle, 10 m

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