Hilary Duff in Bathing Suit Says "My Heart is Full" Celebwell

Hilary Duff is heating things up south of the border! The actress recently enjoyed a girls getaway at Las Ventanas in Cabo San Lucas, Mexico, showing off her incredible figure while enjoying the luxury resort with her gal pals. "One for the books little angels my heart is full and currently detoxing from da ruuuuum tennis match," she captioned her Instagram post. How does she stay so fit? Read on to see 5 ways Hilary Duff 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!

Since giving birth to her daughter with fiancé Matthew Koma in 2018, Hilary has sworn by bodybuilding. "I was thinking I don't need to do heavy weights because if I do heavy weights I'll bulk up. I tend to build muscle fast," she told Women's Health. "I'm lifting and squatting and using a barbell with lots of weight on it, and I've never felt so strong but lean."

Hilary also has a diet coach, who helps her make good choices. "He basically counts your macros for you—and it's been amazing because it's basically like a mathematical equation that I just follow, and it's been really successful for me," she told Women's Health. Prior to evaluating her daily intake of carbs and healthy fats, "I had no idea how much I was eating throughout the day, snacking," she said. "I lost 10 pounds and I was not starving myself, and just eating things that I like and being more conscious."

Hilary sets herself up for dietary success by meal prepping. "On the weekends, I'll meal prep a few things that I can pack with me and bring to set during the week," she told Shape. "I'll make a big thing of quinoa and brown rice, or some chicken and steak chopped up. And then I'll bring some arugula and make a salad with everything. I'll bring an avocado with some lemon and sea salt or fruit for a snack. And since there's a juice place on every corner in New York, sometimes I'll get a protein shake as a meal replacement."

Hilary also makes a protein filled green smoothie. "I'll put in some berries, greek yogurt, nut butter, and egg white powder that I buy it at Whole Foods-I'm really into that and use it instead of regular protein powder. And my favorite green juice I make for myself is spinach, romaine, celery, parsley cilantro, apple, pear, and banana and lemon," she told Shape.

Duff spends extra time on her glutes. "I've been working so hard on my bum lately! I've been doing crazy, crazy, amounts of squats with heavy weights, and weighted deadlifts and hip thrusts. They're so awkward to do because you're basically humping the air, but if they work, I'll do them. It literally changed my whole butt- I've always had a pretty good butt and some meat there but it's made it so much higher than it was, so I'm loving that," she told Shape.

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