Millie Gibson is basking in the sun – in a gorgeous dress. In a new social media post the Doctor Who star shows off her amazing figure in a white sundress and swimsuit while vacationing in Costa Rica. "Pura vida," she captioned the series of Instagram snaps. "Gorgeous babba ❤️🔥" commented one of them. "Beautiful ❤️❤️❤️" added another. How does the actress stay in shape? Here is everything you need to know about her diet and workout. 

Millie is a coffee drinker. According to the Cleveland Clinic, coffee "acts on your brain to improve memory, mood, reaction times, and mental function," they say, citing a study finding that caffeine can improve endurance and performance during exercise. It is also antioxidant-rich, can ward off diabetes, prevent neurologic disease, lower cancer risk, and ward off depression, they point out.

On her recent trip to Costa Rica, Millie went kayaking. Kayaking is a great workout. Not only is it great for building upper body strength and helps reduce stress, but can burn up to 400 calories per hour, translating to 1,600 calories in four hours of paddling.

Millie loves her dog so much she brought him to Costa Rica with her. On the trip they went on lots of walks and hikes. Going for a daily walk can be a game changer in terms of exercise, especially at a brisk speed. One study published in JAMA Internal Medicine found that walking at a brisk pace for about 30 minutes a day led to a reduced risk of heart disease, cancer, dementia and death, compared with walking a similar number of steps but at a slower pace.df44d9eab23ea271ddde7545ae2c09ec

Millie has a favorite cuisine: Italian. She shares lots of photos of pasta dishes and pizza on her social media feed. 

While in Costa Rica, Millie spent a lot of time reading a book on the beach. One Harvard study published in Social Science & Medicine found that people who read books regularly had a 20% lower risk of dying over the next 12 years compared with people who weren't readers or who read periodicals.