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a) Recovery rate at each foot landing subrange in AP direction from −2 to 2 × FL (foot length), the step size between the subranges is 0.1× FL. Based on this recovery rate, the whole foot landing zone could be divided into three groups: backward landing (N = 86); optimal landing (N = 60); and forward landing (N = 30). b) Recovery rate at each foot landing subrange in ML direction from −2 to 2 × FW (foot width), the step size between the subranges is 0.1 × FW.
