(RealAge.com) Burn more fat when you walk -- and make bigger cardio gains -- just by following these three simple walking rules from Andrea Metcalf, author of Naked Fitness.

Here's what Metcalf advises: Challenge yourself with a few hills, regularly change up the terrain that you walk on, and, for really big cardio benefits, mix in a little jogging here and there.

Walking is fabulous (and fabulously easy!) exercise. And it has the highest compliance rate of any exercise around -- probably because it requires little more than a sturdy pair of walking shoes and the great outdoors. What's more, studies show that people who walk regularly are more likely to lose weight and keep it off for the long term compared with people who don't walk for exercise. But why not maximize what you get out of a walking program with Metcalf's simple strategies?

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