Kim Zolciak-Biermann and Ariana Biermann in Bathing Suits "Party"

Reality star Kim Zolciak-Biermann just posted a throwback photo on Instagram. In it, Kim and her daughter, Ariana, posed in matching black bikinis. Kim captioned the post, “Me and my baby @arianabiermann on my birthday back in May!!! RED SOLO CUP LETSSSS HAVE A PARTY. DONT BE TARDY (before you ask... I'm 5'8 and Ariana is 5'3.)” How do they stay so fit? Read on to see 5 ways Kim Zolciak-Biermann and Ariana Biermann stay 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. Ariana Has No Time For Haters

Ariana has no time for haters, especially when they are talking about her body. When someone accused her of having an eating disorder, Ariana hit back on her Instagram story. "I do not have an eating disorder. I worked my a** off to get to where I am today. I am not sick. This is ridiculous and awful to say to someone. Stop commenting on people's bodies and worry about yourself."

2. Kim Eats Healthy

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Kim makes healthy eating a priority. She revealed her diet on her Instagram story. “No pork, no beef, sometimes chicken, pasta, chocolate, veggies and wine.” "It’s never too late to become healthier, and an important part of getting there is to eat healthier. Did you know that by eating a rainbow of colors of fruits and vegetables you can protect your health against such diseases as cancer, heart disease, diabetes and even poor eyesight? The different colors of fruits and vegetables provide you with powerful antioxidants that can boost your immune system and provide protection," says the Mayo Clinic.

3. Kim Likes To Run

Kim revealed some of her wellness secrets in this Instagram post. She wrote that one of her favorite ways to workout is by running. “I run three to four miles five times a week. I have ALWAYS loved to run.” Dr. Carlos Uquillas, an orthopaedic surgeon who specializes in injury prevention at the Cedars-Sinai Kerlan-Jobe Institute, notes that running:

• "Increases endorphin levels – Endorphins are your brain's natural feel-good chemicals, which boost metabolism and provide a positive sense of wellbeing often referred to as a "runner's high."
• Enhances sleep – Better sleep improves metabolism, organ function, and physical and mental energy.
• Lowers risk of depression – Depression is one of the most common mental health conditions and it can make other illnesses worse."

4. Kim Lives An Active Life

In her Instagram post, Kim revealed that she lives an active life. She says that this lifestyle helps her stay in shape. “From the time I get up, to the time I go to bed, I rarely sit down,” she writes. “I don’t do elevators, I’d rather walk 30 flights.” "You don’t need expensive gym equipment to get a good workout. Research shows that stair-climbing helps strengthen and tone your leg muscles. It keeps your leg arteries flexible, allowing blood to move more easily. Better blood flow in your legs equals a healthier heart and body," says the Mayo Clinic.

5. Kim Takes Care Of Her Anemia

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Kim is open about her struggles with her health. She has had heart problems and anemia. She revealed in her Instagram post how she treats her anemia. “I’m anemic and get iron IVs for it often,” she explains. "Anemia is a condition in which you lack enough healthy red blood cells to carry adequate oxygen to your body's tissues. Having anemia, also referred to as low hemoglobin, can make you feel tired and weak," says the Mayo Clinic. "There are many forms of anemia, each with its own cause. Anemia can be temporary or long term and can range from mild to severe. In most cases, anemia has more than one cause. See your doctor if you suspect that you have anemia. It can be a warning sign of serious illness."

Kim Zolciak-Biermann is one of the most well-known reality stars of all time. She first started out in 2008 as a cast member on Bravo’s The Real Housewives of Orange County. She and her family then starred on the spin-off series, Don’t Be Tardy… Zolciak has also started a skincare, clothing, and wig line. Zolciak shared a new swimsuit photo on her Instagram story this week, captioning it, “Getting summer ready.” How does she stay so fit? Read on to see 5 ways Kim Zolciak-Biermann 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 Stays Hydrated

Zolciak shared some of her wellness secrets in an interview with E! News. Specifically, she gave her tips for getting a swimsuit body. Zolciak says that staying hydrated is one of her biggest secrets. "I think getting ready for bikini season is water," she said. "No matter what you really eat, if you hydrate, and drink lots and lots of water, everything's flushing out your system."

2. She Takes Care Of Her Skin

Skincare is extremely important to Zolciak, and she makes sure to take care of it. She even has her own skincare line. Zolciak shared some of her secrets with E! News. "I do take care of my skin. I hydrate with a lot of water. That's really important to me. And skin care products. I've always been into skin care, since I was young, like 14."

3. She Doesn’t Eat Red Meat

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Zolciak shared some of her diet secrets in her E! News interview. She says that there is one food that she cuts out of her diet. “I don't eat red meat,” Zolciak revealed. “Which I don't think a lot of people know. I just don't like it. I didn't grow up on it. I just don't like it. There's no other reason. I do eat chicken and poultry, I think that probably helps.”

4. She Believes In Moderation

Zolciak opened up about her diet in an interview with Entertainment Tonight. “I think the key to staying slim or what have you is moderation,” she shares. “I eat chocolate every day. I drink a glass of wine every day, on average … I know that eating a candy bar is not going to make me fat. In my mind, my mom always said, like, if you think it's gonna make you fat, it will! It's a mind frame and it's a mentality and it's a lifestyle.”

5. She Runs

Kim Zolciak-Biermann/Instagram

Zolciak shared some of her wellness secrets in this Instagram post. One thing she likes to do to stay in shape is run. “I run 3-4 miles 5x a week,” Zolciak writes in the caption. “I have ALWAYS loved to run.” Better Health states that running has a lot of benefits. “The difference between running and jogging is intensity. Running is faster, uses more kilojoules and demands more effort from the heart, lungs and muscles than jogging. Running requires a higher level of overall fitness than jogging. Both running and jogging are forms of aerobic exercise. Aerobic means 'with oxygen' – the term 'aerobic exercise' means any physical activity that produces energy by combining oxygen with blood glucose or body fat.”