Bella Thorne in Swimsuit Top is “Fire”

Bella Thorne, star of The Babysitter series, wore a bikini top and insanely high boots in a new photo. “Thank god there’s a zipper on these 😍,” she captioned it. “💙🔥,” said one commenter. How does she stay so fit? Read on to see 5 ways Bella Thorne 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 Works Out Her Core

“Strong core muscles make it easier to do many activities, such as swing a golf club, get a glass from the top shelf and bend down to tie your shoes. Strong core muscles are also important for athletes, such as runners, as weak core muscles can lead to more fatigue, less endurance and injuries,” says the Mayo Clinic. “Weak core muscles can also leave you susceptible to poor posture, lower back pain and muscle injuries. Strengthening core muscles may also help improve back pain.”

2. She Works Out Her Legs

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“Groundbreaking research shows that neurological health depends as much on signals sent by the body’s large, leg muscles to the brain as it does on directives from the brain to the muscles. Published in Frontiers in Neuroscience, the study fundamentally alters brain and nervous system medicine — giving doctors new clues as to why patients with motor neuron disease, multiple sclerosis, spinal muscular atrophy and other neurological diseases often rapidly decline when their movement becomes limited,” says Frontiers.

3. She Does TRX Workouts

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“Suspension training does it all. It improves muscular strength and endurance while simultaneously improving joint mobility and flexibility. Due to the unstable nature of suspension training, the exercises constantly engage your core and improve your balance. There is no limit to the progressions you can do, and everyone from the most novice exercisers to the most advanced athletes can benefit from using the TRX Suspension Trainer,” says ACE Fitness.

4. She Boxes

Boxing can be great. "You're swinging your arms, moving the muscles of your arms and shoulders, increasing your upper-body strength. And when you're in the boxer crouch with a wide stance, with your knees slightly bent, you're strengthening your core muscles, back, and legs," says physical therapist Linda Arslanian, director of rehabilitation services at Harvard-affiliated Brigham and Women's hospital to Harvard Health.

5. She Does Jump Squats

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To do a squat jump, says the NASM:

“Step 1: Stand with your feet hip to shoulder width apart and toes pointing straight ahead. Draw in the belly button.

Step 2: Rapidly descend to a depth that feels explosive (typically around a quarter squat) while pulling the arms back to the side.

Step 3: Quickly and powerfully reverse the pattern and jump up, raising the arms above the head. Land as quietly as possible and immediately begin the next repetition. Maintain posture throughout.

Step 4: Repeat for the desired number of repetitions. Avoid knees collapsing inward, back arching or slouching, or uncontrolled head movement.”