Katie Austin is one of the most well-known fitness influencers out there. She is also a model for the Sports Illustrated Swimsuit edition, being named one of their Rookies. Austin is celebrating her third year with the brand, and posted a new on-set video on Instagram. In it, she posed in a teal bikini with light blue flowers. She captioned the post, "ON SET WITH @si_swimsuit BABY!!! Year 3 and it's still a pinch me moment. A moment for life!! So so grateful to be here in the Dominican Republic truly living my DREAM🥹 can't wait to share more of my 2023 with you all." How does she stay so fit? Read on to see 5 ways Katie Austin 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!

Austin is the daughter of fitness legend Denise Austin, and tennis player, Jeff Austin. She opened up about her childhood to Yahoo Life. "A lot of her [Denise's] tapes are like, 'Lose the last 10 pounds,' and they are about weight loss as well. But during my childhood and growing up, there was nothing about weight loss and the numbers on a scale or anything like that. I think that's because I was an athlete. My dad was a professional tennis player, so it was always about working out to get stronger and training for something, it was never about the aesthetic. I wasn't working out or running because I wanted abs and I wanted to lose weight or I wanted to drop so many inches on my waistline."

Austin has her own blog, where she reveals her wellness secrets. In this post, she says that she likes to go on walks, especially on days where she's not working out as much. "Go for a walk, first thing in the morning! I love getting fresh air right when I wake up. It gets the blood flowing, oxygen pumping! Since I would normally workout first thing in the morning, on rest days, just exposing yourself to natural light first thing in the morning helps wake your body and mind up naturally."

Austin doesn't believe in motivation, rather she believes in discipline. She explains why to E! News. "You don't always wake up with motivation," she says. "I'm not motivated to work out, it's actually discipline. It should be a habit and ingrained in your schedule. Because you're not always going to be motivated. Just tell yourself you're going to work out for 10 minutes, you're going to start to work out and feel better. You're going to keep going and love the way your body feels."

For Austin, working out isn't about losing weight. She tells E! News, "I personally believe that you work out to feel your best self. Working out truly makes you feel better, more confident, more productive and accomplished. It's also what makes my mom and I so positive. It can really switch your mindset and perspective."

In her blog post, Austin opened up about what she does on her rest days. She says that she loves to use a massager. "One of my favorite things to do on rest days is to use my Wahl Cordless Deep Tissue Percussion Massager. It is literally LIFE CHANGING! It provides all-around and targeted muscle relief, even deep down, to speed up your healing or fitness recovery. Percussion is the ultimate massage experience providing fast comfort by disrupting pain signals and increasing local blood circulation and blocking neurotransmitters and may help decrease inflammation and increase oxytocin levels; all of which allow muscles to relax, reducing feelings of tiredness and pain!"