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Here's another Way to amuse yourself while you exercise. With a Stability Ball. It's unstable. It rolls. Unless you exert force to keep it in place. Which means you engage many large and small muscles. Very time-efficient. And it burns more calories.

Sometimes it's hard to believe your eyes. You get a few of those times on this six-mile hike in the Waimea Canyon on the Hawaiian island of Kaua'i. It's an exhilarating three- or four-hour walk through dense tropical foliage to wide-open views of the place called the Grand Canyon of the Pacific.