![]() ![]() ![]() But longer legs make arboreal life difficult, so once humans got moving, they had to stay on the road. The legs of Homo erectus were 10–20% longer than those of the hominin Australopithecus, which meant the first humans could cover great distances at a lower energy cost. We are what we are because our bodies could do what they did. The two-legs-good, four-legs-bad effect is discussed on at least 40 pages of The Story of the Human Body running, too, gets a good show. For the evolutionary biologist and barefoot runner Lieberman, however, bipedalism was a “monumental and consequential” shift.
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