If you’ve ever watched someone explain something with so much hand choreography that it looks like they’re landing a plane, you might think it’s a bit over the top. But science says those gestures actually shape how persuasive they seem. And honestly, it tracks. We’ve all met someone whose PowerPoint was forgettable, but whose hand motions could convince you to refinance your home.

A new study published in the Journal of Marketing Research analyzed thousands of TED Talks and paired them with controlled experiments to figure out why some speakers project instant clarity.

According to the research, people come across as more competent, coherent, and persuasive when their hands match the idea they’re explaining, as reported by ScienceAlert. This isn’t randomly flailing your arms around. They’re “illustrators,” the gestures that mimic shape, direction, or distance and help your brain picture what’s being said.

Science Says These Simple Hand Gestures Can Make You Weirdly Persuasive

Picture spreading your palms to show scale, bringing your hands together when describing a connection between ideas, or sketching an invisible roller coaster when talking about a market “going up and down.” The study found that these simple movements give listeners a visual anchor, which psychologists describe as helping the message feel easier to process. That ease translates into higher ratings of competence, according to the research team.

To quantify this, researchers used AI tools to break down more than 200,000 video segments from over 2,000 TED Talks. They found that speakers who used more illustrative gestures consistently earned higher audience evaluations. The pattern stayed true in experiments, too, where 1,600 participants rated speakers who used purposeful gestures as clearer and more convincing.

But not all hand movement is created equal. Random waving, distracted fidgeting, or vague air-poking offers no benefit and can even make a speaker feel scattered. The study’s takeaway is pretty simple: gestures only help when they actually show the thing being described.

The researchers suggest that people can be trained to gesture more effectively, almost like picking up a second language. Early tests show that even a five-minute coaching session can sharpen someone’s delivery.

The idea may sound small, but it works. Humans decode each other through more than words, and our hands have always helped us better communicate our thoughts and feelings. Try it the next time you need to convince someone of something. It might just persuade them.