Mexican actress Samadhi Zendejas is enjoying a little blue therapy by the ocean. Zendejas shared pictures of herself wearing a dark green bathing suit, posing next to a sparkling resort pool with blue skies and palm trees in the background. "I'm always a little happier at sea ❤️," she captioned the post. How does she stay so fit? Read on to see 5 ways Zendejas 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!

Zendejas plays tennis for a fun and highly effective full-body workout. "This is a sport that stresses a lot of flexibility, since you need to adjust quickly to reach different shots, and many players often slide, with legs apart, to reach a ball," says trainer Jarett Cascino. "You never want to be flat-footed. If you watch the pros, their heels are slightly off the ground, with their weight on the balls of their feet."

Zendejas loves skiing whenever she gets the chance. "Alpine skiing is a mix of endurance and resistance training," says Dr. Josef Niebauer, a professor of sports medicine and cardiology and director of the Institute for Molecular Sports and Rehabilitation Medicine at Paracelsus Medical University in Salzburg, Austria. "It has positive effects on the heart and circulation, as well as peripheral muscles—predominantly the legs."df44d9eab23ea271ddde7545ae2c09ec

Zendejas uses the treadmill as part of her gym workout routine. "There are many benefits to adding treadmill training into your exercise routine and the convenience of the machine makes it a useful tool in commercial and home gyms," says registered physiotherapist Sam Preston. "It's important to vary the style of your training, as there are different adaptations and responses to each stimulus you apply to the body."

Zendejas exercises with a medicine ball, which experts say can give an edge to your workouts when utilized correctly. "Purchase a weight that will challenge you appropriately," says Nick Parkinson, MEd, AT, ATC, TSAC-F. "Some people think more weight is better, but I encourage people to err on the side of too light so they can really concentrate on technique."

Zendejas lifts weights and uses kettlebells for strength training. Kettlebells can be beneficial for posture, experts say. "With the weight in front of you, your back muscles have to straighten up more to counteract the force of the kettlebell pulling you forward," says Nancy Capparelli, a senior physical therapist at Harvard-affiliated Beth Israel Deaconess Medical Center. "Someone who's five feet tall and 90 pounds will typically use a lighter kettlebell than someone who's six feet tall and 200 pounds."