The purpose of this study was to determine how runners sprinting along a curved path could rotate their whole-body about the vertical axis to keep facing towards ever-changing movement direction. 10 healthy men were asked to run at 5 m/s along a straight path (RS) and a curved path with a 5-m radius (RC). The running direction in RC was counterclockwise (CCW) as viewed from above. A motion capture system with 8 cameras was used to record the three-dimensional coordinates of reflective markers attached to each subject with the sampling frequency set at 240 Hz. The angular momentum of each body segment about the vertical axis passing through the center of mass of the entire body was determined for 1 complete stride cycle with the method described by Dapena (1978). The average value for the angular momentum of the entire body about the vertical axis was determined for each contact phase and each flight phase. Two-way ANOVA (2 movements×4 phases) was used to test the significance of the main and interaction effects. In addition, the angular momentum was categorized into head and trunk, right leg, left leg, right arm, left arm, both arms and both legs, and the pattern of change in each category during the normalized stride cycle was compared between 2 movements. Two-way ANOVA demonstrated a significant main effect for both factors with no interaction. In all phases, the average angular momentum in RC was directed more toward CCW as viewed from above than that in RS. Whereas the angular momentum of the head and trunk in RS changed periodically from positive to negative values, that in RC maintained positive values throughout the stride cycle. The angular momentum of the right leg in RC changed periodically in the same phase as in RS, but that of the left leg changed in the reverse phase. The left leg not only moved back and forth in RC, but also moved from side to side, allowing it to undergo circular motion in a direction opposite to the body's rotation in the horizontal plane. Presumably, this circular motion generated reaction effects on the adjacent segments, causing the head and trunk to gain sufficient angular momentum to keep facing toward the running direction.