In 2020, the world spent more than $7 billion on supplements that promised to enhance brain health. We may as well be setting that money on fire. The quest for the perfect IQ-boosting pill, memory game, or creativity elixir has not been a successful one. If you’re seeking that one weird trick to improve your brain health, the best place to look might be your feet. That’s the conclusion I reached after my journey through hundreds of studies assessing brain zapping, microdosing, games, and other popular interventions for my book, The Tailored Brain. It turns out one of the only legitimate ways to tailor our brains has been available to us all along: physical activity.