Olivia Culpo in Bathing Suit Says "Happy Birthday" 

Olivia Culpo is celebrating her pal's birthday in her bathing suit! The 29-year-old star wished her friend Jackson McDonald well-wishes on his special day, showing off her fabulous figure in a seashell print swimsuit in the main image. "Happy birthday to the life of the party and literally my lifeline! The most charismatic, genuine, kind, and loving @mcdonald_jackson. I'm so grateful to have you in my life. We celebrate you today and every day! Everyone help me wish him a special bday! 🎂❤️🎂," she captioned it. How does the model and entrepreneur maintain her incredibly fit figure? Read on to see 5 of Olivia Culpo's best tips for staying in shape and the photos that prove they work—and to get beach-ready yourself, don't miss these essential 30 Best-Ever Celebrity Bikini Photos!

Olivia is all about healthy eating, most of the time. "I stick to the 80-20 rule," she explained to Hamptons magazine. "Eighty percent of the time I'm really good, and then 20% of the time I allow myself to eat, not whatever, but indulge a little more, I guess you could say." What does she eat? Lots of healthy fiber and protein throughout the day, starting her morning off with coffee with oat milk and a bowl of fruit, avocado toast and egg whites, followed by a salad for lunch. "I love chicken and any veggies with a miso vinaigrette," she told Women's Health. 

Olivia makes sure to constantly move, which is why she created the 20-minute Cardio Challenge on social media. "That is basically 20 minutes of cardio at whatever speed you want. I've been doing it with my followers encouraging them to join the challenge and just do whatever feels right for 20 minutes," she explains. She adds that the great thing is that "it doesn't feel too overwhelming," and it is an easy way to get moving. "Before you know it, it's over."

Olivia makes sure to get a workout in anytime, anyplace. One of the ways she does this is with the P.volve workout method, a low-impact method with portable equipment that can be done anytime, anyplace. "The P.volve workout is great for me because I travel a lot," she told Shape. "There are 3-pound ankle weights, 2-pound free weights, and tons of elastic bands that you can use in different ways." 

Olivia always keeps healthy snacks around to avoid indulging in junk. "I'm obsessed with nuts," she revealed to Women's Health. She also mixes sweet with salty. "I need energy on set, so I like the raisins and the chocolate," she explained.

It's all about consistency, per Olivia. "I've noticed it's very important to be consistent with workouts," she told Shape. "I think it's really easy for people to go through phases where they're really intense with their workouts and then they kind of fall out of it." So, she makes sure to exercise daily. "I try to stay active as much as I can by doing low-impact, high-intensity workouts so that I'm consistent and I don't wake up one day and realize it's been two weeks and I haven't worked out."