Kate del Castillo in Bathing Suit Shares "TBT"

Kate del Castillo is fondly looking back on a film she made years ago. Del Castillo shared a picture of herself dancing in a silver bathing suit in a still from the production. “TBT me in the American Visa movie Oct 21, 2005,” she captioned the post. How does she stay so fit? Read on to see 5 ways del Castillo stays in shape and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bathing Suit Photos!

1. Boxing Workouts

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Del Castillo loves boxing workouts, which have both mental and physical health benefits. “I'd say the number-one thing that sets boxing apart from other workouts is the degree of stress relief. It's unlike any other workout," says professional boxer Arnold Gonzalez. "Boxing builds confidence and discipline at another level."

2. Lifting Weights

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Del Castillo uses both large and small weights for building strength and toning. Experts say building muscle offers a host of long-term health benefits. “There is no doubt that an appropriate weight-training program would improve efficiency in pretty much any athlete,” says Gary R. Hunter, professor of exercise physiology at the University of Alabama at Birmingham.

3. Squats and Lunges

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Del Castillo incorporates squats and lunges into her workout routine. “Lunges, squats, and planks (a move that looks a bit like a push-up and is often substituted for sit-ups) are key moves in most good core workouts,” says Harvard Health. “Sit-ups and crunches—once the bread and butter of core work—have fallen out of favor in recent years. Why? They can actually cause back pain, partly by focusing only on abdominal muscles.”

4. Tequila Lover

Del Castillo’s drink of choice is tequila, which experts stress is fine only in moderation. “Alcohol consumed in moderation may impart health benefits,” says Dr. Sam Zakhari, SVP for Science at the Distilled Spirits Council and formerly a Division Director at the National Institutes of Health. “However consumed in excess, such as binge drinking, or chronic heavy drinking it may be harmful to health.”

5. Running

Del Castillo loves to run, especially as part of circuit training. “All you need is a pair of shoes and some time,” said Anu Gaba, MD, an oncologist at the Sanford Roger Maris Cancer Center in Fargo, North Dakota. “Even if you only have 15 or 20 minutes, that’s a good place to start… The most difficult step is to get your running clothes and shoes on and get out of the house. Once you do that, that step itself will cause such a big upswing in your mood knowing you’re going to do the right thing.”