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our early Australopith ancestors had less-developed arches in their feet. Homo sapiens, by contrast,Lebron James Shoes, has evolved a strong, large arch that we use as a spring when running.“Our feet were made in part for running,” Lieberman said. But as he and his co-authors write in Nature: “Humans have engaged in endurance running for millions of years, but the modern running shoe was not invented until the 1970s. For most of human evolutionary history, runners were either barefoot or wore minimal footwear such as sandals or moccasins with smaller heels and little cushioning.”For modern humans who have grown up wearing shoes, barefoot or minimal shoe running is something to be eased into,www.sportsupplycenter.com, warned Lieberman. Modern running shoes are designed to make heel-striking easy and comfortable. The padded heel cushions the force of the impact, making heel-striking less punishing.