Costeen Hatzi in Bathing Suit Enjoys "Holiday" With Nick Kyrgios

Model Costeen Hatzi and professional tennis player Nick Kyrgios are enjoying a trip together. The couple decided to travel to Nassau, and Hatzi posted photos of them on Instagram. In them, the couple lounged by the clear water. Hatzi captioned the post, “A well-deserved holiday,” referencing Nick's big Wimbledon final last weekend. How do they stay so fit? Read on to see 5 ways Costeen Hatzi and Nick Kyrgios 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. Nick Is Competitive

Kyrgios has to stay healthy in order to be a professional tennis player. His trainer, Matt James spilled some of his secrets to The Huffington Post. James says that Kyrgios is extremely driven and competitive. “He is extremely competitive and always wants to win, whether it's at tennis, basketball or FIFA PlayStation.”

2. Nick Does Fun Physical Activities

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James tells The Huffington Post that he keeps his sessions with Kyrgios fun. "A lot of the training I do with him is not just in the gym. I try to make it fun and introduce non-traditional disciplines into his regimen. We play basketball, mini tennis, we use the Ankorr System [a fitness trend using harnesses], the prowler [a type of sled] for sprint repeat efforts and a lot of tractor tyre flips, sled drags, farmers walks [walks with weights] and others."

3. Nick Is Vegan

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Kyrgios is on a vegan diet, and explained his reasons for doing so in a post on Athlete’s Voice. “I’ve been passionate about animal welfare for some time now. I don’t eat meat or dairy anymore. That’s not for my health, I just don’t believe in eating animals.I tried a vegan diet a couple of years ago but with all the travel I do, it was hard to stick to it. Since then I’ve managed to make it work, and I’ve been vegetarian for quite a while. Seeing the footage of these animals suffering with the fires only reinforces why I’ve chosen this diet. When I see these terrible photos, I can’t comprehend eating meat.”

4. Costeen Swims

Hatzi loves to swim as a way to stay in shape. As you can tell from her Instagram, the model spends a lot of time at the beach and the pool. She posted these photos of herself in the pool while vacationing in Palm Springs. She captioned the post, “Boyfriends of insta,” tagging Kyrgios.

5. Costeen Loves Coffee

Hatzi likes to enjoy a caffeinated beverage. Specifically, coffee. She posted this photo on Instagram of herself enjoying a large glass of it in Palma De Mallorca. According to Hopkins Medicine, coffee has a lot of benefits. “Caffeine is the first thing that comes to mind when you think about coffee. But coffee also contains antioxidants and other active substances that may reduce internal inflammation and protect against disease.”