FAQs > Health and Safety > People didn't always have to walk on hard surfaces like concrete and asphalt. These are different times and cushioning is more necessary now.
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Actually, people have walked on hard surfaces for centuries -- just not always modern paved surfaces. With significant use, trails and dirt paths become extremely compact and hard. Likewise, boulders and other rocks over which people have climbed and walked are just as hard as today's pavement. Modern asphalt and concrete are just flattened, smooth composites of these natural materials.
