“Sometimes you’ve just got to take up space,” says Julia Grace, Slack’s senior director of infrastructure engineering. “They tell you a lot of being successful is just taking up the space.”

For International Women’s Day, 10 powerful women revealed to Fortune the poses that make them feel most powerful. It’s a concept popularized by Amy Cuddy in 2012 with her TED Talk about the idea that your body language shapes who you are—and if you take a powerful stance, you’ll feel more powerful.

Cuddy’s premise—which she came to through a Harvard University study—has been questioned by some of her peers in social psychology. But posing powerfully can’t hurt.

For these 10 powerful women, there’s a lot of standing tall, hands on hips, and crossed arms. Theresia Gouw, Aspect Ventures co-founder, even says she takes her power-posing advice—hands on hips—from Tyra Banks.

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For OkCupid chief marketing officer Melissa Hobley, the pose that makes her feel best is all about making your audience—whether an audience of one or a crowd—feel like you’re listening. Inhi Suh, general manager of IBM Watson Customer Engagement, has a scientific explanation: moving your arms around and lifting them overhead, she says, “pumps adrenaline” and creates a “winning mindset.”

Watch the video to see professional power poses in action and check out the rest of Fortune‘s International Women’s Day Superwomen series here.