Americans shell out billions of dollars every year to improve their health with diets, gym memberships, exercise programs and supplements. But could cracking the code of centenarians—those who live active lives well into their 100s—actually come down to simple habits like eating beans, napping to reduce stress, and walking for the sake of getting around rather than hitting your daily steps goal?

That’s the idea behind the Blue Zones, pockets around the world where people live longer, healthier lives than the worldwide average. These places—Ikaria, Greece; Loma Linda, California; Nicoya, Costa Rica; Okinawa, Japan; Sardinia, Italy—piqued the interest of New York Times bestselling author and longevity expert Dan Buettner who, two decades ago, set out to find what people in these parts of the world are doing differently that could help them live longer. Today, Blue Zones is a trademarked brand with books, a Netflix series, merchandise, pathways for other cities to become “Blue Zone” certified, and even hot sauce collections.