Simone Holtznagel in Bathing Suit Does "White Lotus"

Simone Holtznagel is having the time of her life in Bali, Indonesia. The Australian model looked stunning as she posed in the pool wearing a striped bathing suit and vintage gold belly chain, and couldn't resist sharing the pictures with her fans. "White Lotus: BALI EDITION🌴 day 1 💛," she captioned the Instagram post. How does she stay so fit? Read on to see 5 ways Holtznagel 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!

Holtznagel loves reformer Pilates sessions. "Reformer Pilates globally strengthens the body using the subtlety of the springs to not just target the big muscle movers but also activate the small stabilizers of the body," says Bodylove Pilates founder and instructor Ali Handley. "This creates change, harmony and balance throughout the body."

Holtznagel prefers four meals a day that hit all her macros. "Mini-meals can aid in satisfying the appetite, stabilizing blood sugar levels, and providing nutrients to the body throughout the day," says Katherine Patton, MEd, RD, CSSD, LD. "Smaller, more frequent meals in your daily eating patterns also can aid in a more efficient metabolism compared to a slower metabolism when meals are skipped. An efficient metabolism allows your body to use carbohydrates, protein and fat to fuel your body."

Holtznagel got into the best shape of her life by focusing on a healthy diet with occasional treats thrown in for balance and sustainability. "Simone has done it in a healthy way," says boyfriend and trainer Jono Castano. "She's found the love of food, she's found the consistency and balance for training."

Holtznagel hits the gym four times a week and frequently uses weights for her exercises. "Weight training in particular preserves and builds muscle mass, which elevates metabolism and helps prevent weight gain while maintaining mobility," according to Johns Hopkins Health. "Sarcopenia, or loss of muscle mass and function, is a huge cause of physical disability, and it often starts in middle age. Resistance training also increases bone density, lowers blood pressure and cholesterol, improves insulin sensitivity, and can help alleviate depression and arthritis."

Holtznagel loves to cook at home, and frequently makes delicious pasta from scratch. "When I think about foods that deliver on comfort, tradition and enjoyment, pasta is at the top of the list. In fact, pasta is a staple in the Mediterranean diet and can be culturally diverse," says Leslie Bonci, MPH, RDN, CSSD, LDN. "Pasta adds beneficial nutrients to the plate such as carbohydrate, fiber, protein, B vitamins and iron – in addition to being a perfect partner to protein and produce."