Secrets of the Blue Zones

The next stop on our blue zone tour is Sardinia, a Mediterranean island 120 miles off the coast of Italy. Here, you'll find the highest number of male centenarians in the world.

When Dan drops in on 105-year-old Giovanni, he's greeted with a glass of wine—at 10 a.m.! Then, to test his strength, Dan challenges Giovanni to arm wrestle—and loses.

Giovanni spent most of his life walking Sardinia's rocky terrain as a sheep herder. The low-impact exercise helps keep his heart strong, especially since a daily Sardinian hike through the mountains can burn up to 490 calories an hour.

What fuels Giovanni? "I eat bread, cheese and dark wine," he says.