Christie Brinkley in Bathing Suit Says "This One's For You"

Christie Brinkley celebrated International Women’s Day with a few of her favorite ladies. The 68-year-old supermodel rocked a white swimsuit in a video shared to her social media on Tuesday, looking absolutely fabulous. “Ladies .. this one’s for you! Happy #internationalwomensday #iwd,” she captioned it. How exactly does she manage to look decades younger? Read on for 7 of Christie Brinkley’s top 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 Bathing Suit Photos!

1. Stay Active

Christie promotes activity: “Don't stop moving because you'll rust. You have to grease the joints and keep moving," she told The Cut. "As long as I do that I feel great. If you start to hold still, they'll start acting up." One way she stays fit? Exercising during daily activities. "While I'm brushing my teeth, I'm doing leg lifts. When I'm drying my hair, I do all kinds of squats,” she said.

2. Eat Big in the Morning

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Christie is all about a big breakfast, which helps her stay fueled throughout the day. "A lot of mornings lately I will take a bowl and I throw some oatmeal right into it," she explained to Shape. "I rarely have time to cook it so I just eat it raw. Then I'll pour some flax seed on top of that and maybe a little wheat germ, then I'll grab a couple of handfuls of blueberries, blackberries, raspberries and rinse them off, toss them in and then I pour one of those Dannon things on top and stir it up. I always describe it…it's like a really moist juicy muffin. It is so good. I feel like it is giving you a lot of good things. You can also throw a handful of walnuts in there."

3. Eat a (Mostly) Plant-Based Diet

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Christie promotes a mostly plant-based diet. "I haven't touched a piece of meat since I read a graphic description of Chicago's slaughterhouses when I was 12," Brinkley told Harper's Bazaar. "I call myself a flexible vegan because, you know, Italy exists. Mozzarella and pasta exist. In France, I may have to have a piece of Camembert, you know. Un petit sandwich au fromage,” she added to The Cut.

4. Eat Colorfully

Christie infuses color into her diet. "For lunch, I go into greens and do a salad, then add a protein like a bean or nuts," she told The Cut. "For many, many, many years, I've always said go for as many colors as possible in a day," she said. "That's my main concept for making sure my kids get all the nutrients—making sure the deep greens, yellows and reds and purples, all of that."

5. Drink Hot Water with Lemon

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Christie is one of the many stars who swears by this morning drink. "I start every day with warm water and lemons. It's something I picked up on my Instagram," she told The Cut. "Some days I alter it, and I get fancy and I put a little bit of mānuka honey on the rim of the glass, turn it upside down, and dump it in red cayenne pepper. Then I put the lemon juice in and then the hot water. That's when I have a little time. I figure that the pepper gets my system all revved up, and the lemon water gets everything flowing through."

6. Do Outdoor Activities

Christie stays active outside. "When I was doing Chicago, I noticed that the second you do any activity and you add your arms as though you're dancing, it revs you up. Whether it's walking down the beach and moving your arms like you're swimming, or picking up rocks and walking with them, you really start sweating and breathing heavily," she told The Cut. Bicycling, paddleboarding, surfing, skiing, and swimming are also her faves, she told Harper’s Bazaar.

7. Take Exercise Classes

Christie is all about exercise classes. "Everyone asks if I really use the Total Gym, and I do! It's perfect for stretching and lengthening my body. Last summer I got into SoulCycle, and in the winter I do yoga at Yoga Shanti,” she told Harper’s Bazaar.