Big Brother star Luisa Zissman is enjoying a fun-filled vacation in Koh Samui, Thailand. Zissman shared pictures of herself wearing a yellow bikini, happily playing in mud with some contented pigs. "I can confirm when rolling around with these guys I really was happy," she captioned the post. How does she stay so fit? Read on to see 5 ways Zissman 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!

Zissman is used to being in the public eye, and refuses to allow any criticism or trolling to change her behavior. "I don't feel under pressure to lose weight," she says. "I've learned to toughen up and after some time now I think it's funny when people are mean, it doesn't bother me. If I cared what people thought of me I'd never get out of bed. I make money off the fact that people know who I am. I don't feel under pressure to change, I take the good with the bad."

Zissman enjoys fruit and nuts as a healthy workday snack. "Including nuts in your diet has been associated with improved heart health," says registered nutritionist Kerry Torrens. "This is because consuming nuts helps maintain the health of the lining of the arteries, balances cholesterol and reduces the build-up of deposits called plaques, while also lowering the risk of blood clots."

Zissman is a seasoned equestrian who loves show jumping—but you don't have to be an expert to enjoy the benefits of horseback riding. "For the average junior or amateur rider who trains in the saddle at least two to three times per week, riding is a great addition to an exercise program," says professional hunter-jumper rider and trainer Melissa Gruber. "Riding is a total body workout. Your legs, arms and core work together to conhttps:// and communicate with the horses. Really, riding is a partnership sport; the rider and the horse support and guide each other. Just like dancing or ice skating with a partner, horse and rider communicate through body language and touch."

Zissman finds it easy to eat a healthy diet, as she genuinely enjoys nutritious foods. "I was raised on a very healthy diet," she says. "When I was younger, I only used to eat chicken and now I'm completely vegetarian. Salad is my favorite food, so for me it's not like, 'Oh, I've got to eat healthily.'"

Zissman loves going on skiing trips, which are not only good for exercise but great for mental health, too. "When you're skiing, you're often out with a group of friends and you're socializing," says physical therapist Scott Tremmel. "You're getting fresh air and taking in the beautiful scenery around you. It's good for your emotional health."df44d9eab23ea271ddde7545ae2c09ec