Walk through any park these days and you might spot them: people sporting bulky weighted vests, adding 10, 20, even 30 pounds to their morning stroll. Scroll through social media and you'll find countless influencers touting weighted vests as the secret to building unbreakable bones and sculpted muscles. Many videos have gained hundreds of thousands of views with claims that weighted vests will "transform your body"—a claim that, to be fair, is par for the course in any fitness trend. "Weighted vest walks" are popular enough to be parodied, and even if I find those videos a little mean-spirited, they do point to an important question: Does this trendy fitness accessory actually deliver on its promises?

Let's dig into what science really says about weighted vests—and what they can (and can

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