Even if we can't afford luxurious relaxing ways, we can just walk at least. Experts say walking is one of the best ways to stay healthy. They call it the world's most natural exercise.Even if we can't afford luxurious relaxing ways, we can just walk at least. Experts say walking is one of the best ways to stay healthy. They call it the world's most natural exercise. Walking is less dangerous than running. About fifty million Americans are active in what is called "fitness" walking. They take short walks a few times each week to improve their health.