Speed Groups Dimensionless Speed Number of Trials Very Slow v ≤ 0.382 43 Slow 0.382<v ≤ 0.495 41 Free 0.495<v ≤ 0.581 42 Fast 0.58<v ≤ 0.721 43 Very Fast v >0.721 39

Table 4: Post hoc classification of walking speeds among the five speed categories.