Its top speed was estimated at 4.97 meters per second; This was much slower than modern humans, who can reach speeds of 7.9 meters per second, or record holder Usain Bolt’s speed of 10.44 meters per second.
Lucy’s body, with shorter legs and weaker calf muscles, made running inefficient and tiring. The smaller size of the Achilles tendon and the need to expend more energy to run underscore the evolutionary steps our ancestors took to become better runners, scientists report.
Source: Ferra
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