Group means (column height) and standard deviations (bar) of a) angles of all joints at the instant of leading foot touchdown (TD), b) the sensitivity of the body center of mass (COM) position relative to the base of support to the changes in angle of the leading foot, leading ankle, leading knee, the pelvis, the leading hip, trailing hip, trailing knee, and trailing ankle at TD, and c) the sensitivity of the step length to changes in angle of the leading foot, leading ankle, leading knee, the pelvis, the leading hip, trailing hip, trialing knee, and trailing ankle at TD.