Millie Bobby Brown in Bathing Suit Says "Happy Birthday"

Millie Bobby Brown is celebrating her boyfriend’s birthday in her swimsuit! The Stranger Things star, 18, shared a few photos to commemorate her beau, Jake Bongiovi’s, special day. She captioned a snap of the two frolicking on the beach, “happy birthday baby, can't wait to fly to the moon and back with you! (Schroobie noobie)” How does the actress prioritize health and wellness? Read on to see 5 ways Millie Bobby Brown 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 Does Strength Training

Millie has shared photos of herself working out at the gym. Per Seventeen, in one of her Instagram Stories she perfectly executed knee-to-chest reps, an arm routine, and ab work. To work out your abs, try this modified plank from the Mayo Clinic:

• "Lie on your stomach. Raise yourself up so that you're resting on your forearms and your knees. Align your head and neck with your back, and place your shoulders directly above your elbows. Tighten your abdominal muscles.
• Raise your right arm off the floor. Hold for three deep breaths. Repeat with your left arm.
• Raise your right leg off the floor. Hold for three deep breaths. Repeat with your left leg.
• For added challenge, raise your left arm and your right leg at the same time. Repeat with your right arm and left leg."

2. She Fights

Dave J Hogan/Getty Images

Millie is a fighter. “It’s not a training workout. I train to box,” she told Vulture. “Obviously I don’t want to do it professionally. But I have done some inter-clubs before. It’s at Phoenix MMA U.K., down in London. It’s a great gym, and I have lots of friends. Because I’m homeschooled, I get kind of lonely sometimes. So I like to go to the gym. I do Thai boxing Mondays, jujitsu Tuesdays and Thursdays, and Wednesdays I do boxing with Mark. He was a world champion at one point. I absolutely love it. I actually have a punching bag right outside in my garden. I’m obsessed with working out. I eat like a pig so it kind of makes up for that.”

3. She Doesn’t Like to Work Out

Mike Marsland/WireImage

Millie confessed to Glamour UK, that “shockingly” she doesn’t like to work out. “I'm good at working out my face, not good at working on my body,” she said. “I find it important, though, as we all have to be healthy and give our body the exercise it needs.”

4. She Loves Aerial Silk

Joe Maher/Getty Images

In her latest film, Millie does all the aerial work. “I love aerial silks. It's always been a passion of mine,” she told Glamour UK. “So I find using aerial silks really fun and therapeutic – it gives me a break from the world. And you find art within it. While I was doing it, I thought, gosh, the silks in so many ways represent womanhood: there’s strength, both masculinity and femininity, and you can create poses and shapes that are so different to show your sexuality,” she continued. “It represents so much: you can be big and you can be tiny and you can be afraid of the silk. You can be afraid of the height you are going at. You can be afraid of how low you are. And so it represents a story.”

5. She Is Active Outdoors

Joe Maher/Getty Images

When Milie isn’t working, she can often be found outdoors. A few of her favorite activities? Spending time on the beach and scuba diving. “bye buddy, i hope you find your dad !” she captioned this image. "Whatever activity you choose, do it regularly. Aim for at least 150 minutes a week of moderate physical activity or 75 minutes a week of vigorous aerobic activity — preferably spread throughout the week," says the Mayo Clinic.