Andrea Serna in Bathing Suit is "Happy"

Colombian star Andrea Serna is thrilled to share her new swimsuit collection with the world, featuring the best model—herself! Serna posted pictures of herself posing in one of her new black two-piece swimsuits, looking happy and healthy. “But how can you not be happy when you feel so connected to this challenge? And that is just beginning,” she proudly captioned the post. How does she stay so fit? Read on to see 5 ways Serna 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 Plays Tennis

Serna enjoys regular tennis matches, which experts say is an excellent workout. “Is it any wonder that scientists and physicians around the world view tennis as the most healthful activity in which you can participate?” says Jack L. Groppel, PhD. “There may be other sports that can provide excellent health benefits and some which can provide mental and emotional growth. But no sport other than tennis has ever been acclaimed from all disciplines as one that develops great benefits physically, mentally and emotionally.”

2. Swimming With the Family

Serna loves swimming, especially with her daughter. "Because the activity is less weight-bearing, certain groups of people can take advantage of it if they want to be active,” says Brian Wright, associate professor of kinesiology at DePauw University. “One can also continue to do it late into one's age, as opposed to weight-bearing activities like running.”

3. Building Strength

Serna says building strength makes her feel powerful and full of energy. “Feeling strong, that's the question,” she captioned a post. “When exercising I am not motivated by the fact that I have more or less volume, when I get on the move, what really drives me is the feeling of vitality, that's what I like, and you? 👊🏼.”

4. Music During Workouts

Serna loves listening to music to help boost her workouts. “Music… seems to reduce people’s feeling of how much they are exerting themselves,” says Art Markman PhD. “That is, at the same level of intensity of activity, listening to music can make you feel like you are exerting less effort than you would feel without music. Some studies have also shown that when athletes are free to set their own exertion level, they are willing to exercise more intensely with music than without.”

5. Fruit and Oatmeal

Serna’s go-to breakfast is fresh fruit and oatmeal. “There are always ways to make things unhealthy, and that’s what we see with a lot of instant oatmeal,” says Beth Czerwony, RD. “Food manufacturers will add sugar — a LOT of sugar — to make them taste better. Check the nutritional label and look for added sugars. If you see them, look for another option.”