Kim Zolciak-Biermann in Bathing Suit is "Getting Summer Ready"

Happy birthday, Kourtney Kardashian! Her younger sister, Kim, celebrated the special day yesterday by sharing a photo of the duo rocking matching blue swimsuits while taking a dip in the ocean. “Each year around the sun with you I learn and grow and evolve more because of you! Thank you for teaching me to always go for it and follow my heart even if no one else understands. They just aren’t on our growth path lol Happy Birthday @kourtneykardash! Happiness looks so good on you. I love you so much!!!” she captioned the series of snaps. How do the sisters maintain their famous figures? Read on to see 8 of Kourtney Kardashian and Kim Kardashian’s top stay-fit secrets 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. Kim Lifts Weights

Kim achieved her best body ever with the help of bodybuilder Melissa Alcantara. "I’ve been working out really hardcore with a bodybuilder for one year. September is our one-year anniversary,” Kim revealed to E! News in 2018, via People. Kim lifts “heavy weights,” per her trainer who told Women’s Health that 85% of their training is done with weights and the other 15% is cardio.

2. Kourtney Exercises Daily

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Kourtney tries to move every single day. "I think I take time for myself to work out every day, which I never did—especially having three young kids," she told E! News. "I just never made it a priority, and now it just makes me feel so much better—mentally and physically." She does a variety of workouts including strength training, jump roping, running, lifting weights, stairmaster cardio, Pilates, and floor exercises. (For her website’s advice on how to burn fat in 15 minutes, go here.)

3. Kim Works Out Even When She Doesn’t Feel Like It

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Kim has a no-excuses policy when it comes to exerise. "Just like anybody else, there are days where Kim's not really feeling it, but she will do it," her trainer told People in 2020. "Then there are a lot of days when she's killing it! She never questions the stuff that I make her do, she's just like, 'Okay,' and I love that."

4. Kourtney Has Workout Buddies

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Kourtney relies on workout buddies to keep her accountable, including friends like Sarah Howard and her sister, Khloe. “I know for my body, I need four to five days a week of working out. Khloe and I really push each other to do that,” she told E!

5. Kim Fuels Up For Exercise

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Kim doesn’t starve herself thin. In fact, she eats to fuel her workouts. "My trainer Mel always says that before and after you train, you should eat simple carbs, like sweet potatoes, and small amounts of fat and protein, like chicken. You should also have veggies with your meals, since you need them to help effectively break down and absorb your protein, fat, and carbs,” she wrote on her app in 2018, according to Harper's Bazaar.

6. Kourtney Takes Supplements

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Kourtney is a big fan of supplements. "Every morning, when I wake up, I take collagen supplements on an empty stomach," Kourtney dished on Poosh. She starts her day with water mixed with one tablespoon of organic apple cider vinegar. "Both of these habits have a ton of health benefits that affect everything from your skin to the way your body processes nutrients," she said. She also drinks a vegan probiotic shot, and then avocado pudding with the fruit and E3Live blue-green algae, bone broth protein powder, and MCT oil. "It only takes a few minutes to make and it provides healthy fats to give me energy before a workout,” she says about her routine.

7. Kim Eats Lots of Plants

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Kim famously followed the Atkins diet, but has been gravitating toward plant-based living for the past few years. "My 40s are about being Team Me. I'm going to eat well,” she told Vogue. "Plant based and two workouts a day for 30 days to get our mind and body right this year!" she wrote in a January 2021 Instagram post.

8. Kourtney Celebrates Her Curves

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Kourtney, who recently gained weight during IVF treatments, as the medication she was given put her into menopause, has major self-love whether she is at her thinnest or curviest. "I'm a woman with a BODY,” she wrote in response to a user asking if she was expecting when she had gained a little weight. “This is me when I have a few extra pounds on, and I actually love it,” shesaid to a follower during another body shaming incident. “I have given birth three amazing times and this is the shape of my body.”

Kim Kardashian is modeling the latest SKIMS collection, a tiny bathing suit of course. The reality bombshell flaunts her famous curves in a sparkling style from her incredibly popular clothing line, provoking lots of comments from her millions of followers. “So bomb,” wrote one. “Hot,” added another. How does the 42-year-old stay so fit and how did she recently lose a ong of weight? Read on to see 5 ways Kim Kardashian 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!

1. She Cares About Looking Good “More Than 90 Percent” of People”

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“I care. I really, genuinely care about looking good,” Kardashian told Allure in a recent interview. “I probably care more than 90 percent of the people on this planet. It’s not easy when you’re a mom and you’re exhausted at the end of the day or you’re in school, and I’m all of the above. I do my beauty treatments usually late at night. After everyone’s in bed, I’m doing laser treatments.” However, in the interview she denied using filler in her lips and cheeks, only copping to Botox. “Never filled either one, ever,” she said.

2. She Went on a Drastic Diet for the Met Gala

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Kardashian famously dropped 15 pounds in just three weeks so she could squeeze into Marilyn Monroe’s iconic dress for the Met Gala in May 2022. How did she do it? According to Kim she cut all carbs and sugar out of her diet and drank a lot of water. “Two weeks before [the Met Gala], I was 10 pounds down and I was so proud of myself,” she said. “Then I got down 15 [pounds] and it fit. I couldn’t believe it.”

3. She Claims It Was Healthy

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Kim underwent a lot of scrutiny for her dramatic weight loss, but claims she did it the right way. “If I was starving and doing it really unhealthy, I would say that, of course, that’s not a good message. But I had a nutritionist, I had a trainer. I have never drunk more water in my life. I don’t see the criticism for other people when they lost weight for roles — they are [considered] geniuses for their craft,” she told Allure. “There are so many things out there that are so not accurate and not true.”

4. She Follows a Plant-Based Diet

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Kardashian, chief taste consultant for Beyond Meat, follows a plant-based diet. However, to lose the weight for the Met Gala she incorporated meat back into her diet. Then “psoriasis broke out over my body and I got psoriatic arthritis so I couldn’t really move my hands,” she told Allure. “It was really painful, and I had to go to a rheumatologist who put me on a steroid. I was freaking out. I cut out the meat again, and it’s calmed down.”

5. She Works Out…A Lot

Kim is famous for her intense workout regiment. Her trainer, Melissa Alcantara dished on the details to Women’s Health. “Her schedule is crazy, and mine is also crazy, so we work out really early in the morning at 6 a.m,” she said, adding that "85 per cent of our training is weight training, and the other 15 is made up of cardio" and that Kim works out six days per week for 60-90 minutes each time. What exercises does she do? Ball slams, burpees, sprints, and ladder drills to get her heart rate up. "She’s super responsible, she never cancels – she’s the best client and athlete you can have," Alcantara shared. "It’s just her drive. She's like, ‘I have to work out, this is part of my life.' It’s all about the mindset." To get into shape for the Met, Kim added another element. “I would wear a sauna suit twice a day [and also] run on the treadmill,” she told US Vogue.