Sarah Michelle Gellar in Bathing Suit is a "Barbie Girl" Celebwell

Sarah Michelle Gellar is channeling Barbie in her bathing suit. The gorgeous Buffy the Vampire Slayer star shows off her forever young figure in a bright pink Barbie swimsuit in one of her latest social media posts. "I'm a Barbie girl, in a Santa world," she captioned the Instagram snap, taken while on vacation.

Sarah Michelle Gellar is channeling Barbie – in her bathing suit. The gorgeous Buffy the Vampire Slayer star shows off her forever young figure in a bright pink Barbie swimsuit in one of her latest social media posts. "I'm a Barbie girl, in a Santa world," she captioned the Instagram snap, taken while on vacation. How does the actress make 45 look like 25? Read on for 5 ways Sarah Michelle Gellar 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!

Sarah loves exercising outdoors, "swimming, hiking, anything like that is great," she said in an interview. Another one of her favorite vacation workouts? Paddle Boarding. "Taking a selfie on paddle board is not easy," she captioned a vacation snap. The American Council on Exercise (ACE) agrees that paddle boarding is great for the core and also a great form of cardio. It can burn an average of 385 calories for a 140 pound male and 436 for a female the same size, per a study conducted by Arizona State University.

Sarah starts her day with coffee and veggie juice. "My favorite thing is to have a green juice," she told The/Thirty. "I go every weekend to the farmers market and I get fresh kale, spinach, celery, and lettuces and I blend it all together. That's my favorite thing before I work out."

Sarah is one of the many stars who are obsessed with a certain vibrating workout. "I love PlateFit and the feeling of being on a Power Plate," Gellar revealed. "I love how quickly I can work out and get such a great exercise." Sarah also rotates other forms of fitness into her routine. "I love Pilates because it centers me and it also strengthens my body."

Sarah prioritizes self-care. "Sometimes, I'm so tired at the end of the day I just want to go to bed, but I have to take time for myself to take a bath, read a book, or catch up with my friends so I don't lose myself in the minutiae of the day," she told Bustle. Sarah's one "beauty/self-care must-have" doesn't cost a cent. "It's probably sleep because I need it and I'm very cranky without it," she told Health. 

Sarah doesn't pay attention to the numbers on the scale. "I don't believe in trying to trick your body into things," she told Health. "I eat healthy, I exercise, I love food—but I don't like junk food. I mean, were women. We go up by five pounds, we lose it, depending on the water, the moon, your cycle, whatever. So I just try to maintain."

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