Polish sprinter Justyna Święty-Ersetic is enjoying some much-deserved "happy moments." The professional athlete shared a picture of herself posing by a pool in a black bathing suit, soaking up the sunshine. "It was a nice week 🌞," she captioned the post. How does she stay so fit? Read on to see 5 ways Święty-Ersetic 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!

Święty-Ersetic enjoys cross training as part of her exercise routine. "If you ask 10 other runners to name a benefit of cross-training, at least 8 of them will mention injury prevention," says coach, nutritionist, and author Matt Fitzgerald. "But although injury prevention is by far the most widely recognized benefit of cross-training among runners, it's hardly the only one. Runners can also use cross-training to rehabilitate injuries, improve fitness, promote recovery, enhance motivation, rejuvenate the mind and body during breaks from formal training, enjoy competing in other endurance sports, and even stay fit through pregnancy."

Święty-Ersetic loves riding her bike outside in the sunshine. "Exercising, particularly outdoors, drives tremendous mental health benefits, ranging from reducing depression and anxiety to enhancing self-esteem and mood," says Cedric X. Bryant, PhD, FACSM. "Combine that with the physiological benefits of exercise, and you'll see greater levels of joy in your life."

Święty-Ersetic uses weights as part of her strength and resistance workouts. "Strength work accomplishes three big goals for runners," says USATF-certified running coach Jason Fitzgerald, founder of Strength Running in Denver, Colorado. "It prevents injuries by strengthening muscles and connective tissues; it helps you run faster by improving neuromuscular coordination and power; and it improves running economy by encouraging coordination and stride efficiency."

Święty-Ersetic enjoys cooking healthy food at home, including omega-3-packed whole baked fish with garlic. "Omega-3s have been shown to reduce blood clots [which can cause heart attack or stroke] because they prevent blood platelets from getting sticky," says Julia Zumpano, a dietitian at the Miller Family Heart & Vascular Institute at the Cleveland Clinic. "They also lower triglycerides — fat that can accumulate in the arteries — reduce blood pressure and inflammation, and increase levels of good cholesterol."df44d9eab23ea271ddde7545ae2c09ec

Święty-Ersetic has a fully-stocked at-home gym which includes a stationary bike. "Cycling is a great cardiovascular workout to strengthen the heart, lungs, and muscles," says Erin Jalkanen, Certified Personal Trainer at Ascend Fitness and Spa. "This in turn also helps to lower blood pressure, improve your sleep, and lower stress levels."