Olivia Culpo in Bathing Suit Says "Happy Birthday Christian"

Olivia Culpo is celebrating her NFL beau's birthday in her swimsuit! The model honored her boyfriend, Christian McCafferty, on his special day, sharing a bunch of photos of the couple, and flaunting her fabulous figure in the process. "It's someone's birthday!! I love you so much Christian. You are the most dependable, inspiring, thoughtful, + grounding person and I feel so lucky to call you mine," she captioned the post. How does the star keep herself fit? Read on to see 8 of Olivia Culpo's top do's and don'ts 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 Bathing Suit Photos!

If you want a body like Olivia's you are going to have to eat healthy, most of the time. "I stick to the 80-20 rule," she dished 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." Her diet involves lots of healthy fiber and protein throughout the day. She starts 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 is always on the go. This is one of the reasons why she created the 20-minute Cardio Challenge on social media, a workout short enough to slip into your day. "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 doesn't forget to bring workout tools with her when she travels. One of her go-tos? P.volve, 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." 

To avoid reaching for junk, Olivia brings healthy snacks with her. "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.

"I've noticed it's very important to be consistent with workouts," Olivia 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." She continued, "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."

Olivia exercises almost every day. "I try to workout as many times a week as I can," she told HollywoodLife. "Ideally, I workout five times a week but when I'm traveling for work or on set for 12+ hour days, it's more difficult to carve out time."

Want Olivia's flat abs? The star revealed to HollywoodLife that one workout is responsible for them. "Cardio is a huge part of getting abs! When I am running regularly, I can actually achieve abs comparable to when I am doing regular ab exercises. Cardio helps keep your BMI low and also stimulates your metabolism so it stays at a higher rate throughout the entire day. So your body is in fat burning mode for much longer, it's like the gift that keeps on giving," she said. 

Culpo revealed to Shape that she makes sure to eat her veggies. However, she steams them instead of just eating them raw. "I think it's easier to digest [vegetables] when they're steamed, as opposed to raw," she said.