Kate Beckinsale in Bathing Suit Shares a Cat Selfie

Kate Beckinsale is a successful actress, best known for her role in the Underworld film series--and for her social media exploits. She just shared a stunning new photo on her Instagram story. In it, she lounged outside with her cat. She wore a light blue and white checkered bathing suit, showing off her body. Her co-star? A cat. How does she stay so fit? Read on to see 5 ways Kate Beckinsale 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 When She’s Stressed

Kate Beckinsale/Instagram

For Beckinsale, working out is an important part of her life. She says that it helps her whenever she’s stressed. “I’m very connected to my body, so if I’m going to experience stress, I’m probably going to experience it physically,” she tells Women’s Health. “So it’s usually a good idea for me to go do something physical to get rid of it. I kind of have to think of myself as a horse or something – time for a run around the paddock.”

2. She Loves Yoga

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Beckinsale loves to practice yoga as a way to stay in shape. She says that it helps her when she has a role in an action movie, and helps her prevent injuries. “I haven’t been injured while doing an action movie, and I think it’s partially from practicing yoga,” she told Women’s Health.

3. She Does Trampoline Classes

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Beckinsale revealed some of her favorite fitness activities to Women’s Health. The actress revealed that she is doing a new type of exercise. “I just got into trampolining, and it’s the greatest thing. There’s this woman, Lauren Kleban, who does LEKFit, and I think she’s a genius because she streams classes online.”

4. She Strength Trains

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Beckinsale posts a lot of workout videos on Instagram. One thing she likes to do to stay in shape is strength training exercises. She posted this video of herself flipping a large tire. Beckinsale captioned the video, “Avail for farm work.”

5. She Does Ab Workouts

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Beckinsale has amazing abs, which means she does a lot of ab workouts. She posted this video on Instagram of herself doing crunches. In it, she is hanging upside down from a set of bars. "Combined flexion/extension with rotation is considered by many to be the most challenging way to use the core, but it is essential. After all, life will make us combine flexion/extension with rotation at some point, so it is advisable to prepare for it. Preparing the body for the most challenging movements in a safe, sensible, controlled way is essential for handling the unpredictable movements life throws at us, such as when we drop a cell phone or if a pet runs into the road, for example," says ACE Fitness.