Jessica Biel in Bathing Suit Wishes "Happy Birthday" to Justin 

Jessica Biel is wishing her husband, Justin Timberlake, a Happy Birthday, in her bathing suit! The mother-of-two shows off her famous figure in a swimsuit and t-shirt in one of her latest social media posts, sitting on a boat with her hubby. “Happy birthday to the person who challenges and inspires me every day. The person who keeps me laughing and creating and risking it all. The person who makes the ordinary extraordinary. You know who you are. I love you,” she captioned the Instagram post shared with her 12.5 million followers. How does the actress keep herself so fit? Read on to see 5 of Jessica Biel’s top diet and fitness tips for staying 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. Know Your Body

Jessica stresses the importance of understanding your body. "I'm aware of how my muscles feel, what it feels like when anything changes. Playing sports and being physical helps me maintain that sort of relationship with my own body. So when I'm doing something, or performing in a physical role, I understand that," she explained to ESPN.

2. Hit the Gym…But Not Alone

Jessica trains with celebrity body guru Ben Bruno and even does workouts with her husband, the perfect workout buddy. “Please excuse the photobomb from @justintimberlake while @jessicabiel casually knocks out a super-impressive set of single leg squats,” Bruno captioned one video of their workout. “We’ll give Justin a pass since he’s doing sled rows with four plates on the sled and making it look easy. They’ve definitely gotta be one of the fittest couples around, and they always work hard in the gym while also making sure to keep it fun. Very cool.” In another post she works out with Justin. “Swolemates,” she captioned it.

3. Do Yoga

"I started getting into yoga about 10 years ago through a close friend who was an instructor. At first I felt like, ‘I can’t do all those crazy poses,’ and I still can’t, but I’m not competing with anyone. I want to demystify yoga and bring it out to more women and men in the community, where it doesn’t have to be intimidating,” Jessica told Gaiam about her love of posing.

4. Approach Diet with Moderation

Jessica has a moderate approach to diet. "I'm not all-out anything," she confessed to Los Angeles Times. However, she does avoid a few types of food. "Honestly, I just feel better when I don't have gluten or wheat or dairy," she said. "My digestion is better, I feel better, I have more energy." She also detailed her diet to the publication. “We’ll start off with Paleo pancakes with some cashew or almond butter on top with some local honey, and we like chicken-apple sausage, and then maybe a fresh juice from the Juicero machine, which we love, we have some green tea with honey—that’s a pretty normal morning for me,” she said. Then, for lunch, she might eat a salad with greens from her garden with quinoa or a veggie burger from Whole Foods and nuts. One of her favorite snacks is gluten-free pretzels with dairy-free almond 'cheese' dip. “And then dinner, if we’re home, it would be cooking up some salmon, some rice, grilling some vegetables, or going out and having some chicken, something a little heartier for dinner,” she added

5. Take a Hike

Jessica is a big hiker. "I've learned that I can push forward, which was exciting for me,” she told Glamour about hiking Mount Kilimanjaro. “When you get out into the wilderness and strip [away] all of the stuff in your everyday life, you really gain a great respect for your own life, simply as it is. Needing things starts to feel like, Oh, I kind of have everything, don't I? It's pretty great."