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They found that these cheetahs just ran at less than 40 miles per hour,slightly lower than the top speed for the greyhounds be cause they have less motivation to run hard,even when a chicken is in front of them. Dr Wilson,one of the researchers,found that when the cheetahs felt like it,their leg turnover rate increased and their pace increased.They began bringing their legs around faster and faster.Their strides (lengthened,and the frequency of their strides increased.However,the greyhounds maintained fairly even stride frequency throughout their entire run.The cheetahs also hit the ground differently from the greyhounds, their paws remaining on the ground slightly longer. The lessons for human runners are somewhat abstract,since