This study investigated the pronation behaviors as a function of speed during continuous treadmill running. Pronation angle during the support phase was determined at two running speeds (normal training and fast) for 3 experienced runners. The fast speed was an increase of 15% above normal training pace. High speed video (125 Hz) was collected and trial data were digitized to obtain x, y coordinates; pronation angles were then computed. The data for participant 1 was omitted since the markers were often obstructed from the camera view. Participants 2 and 3 displayed all four pronation curve behaviors indicated in past research. These 2 participants selected a bimodal behavior more often at the faster running speed. The results support previous research that runners will exhibit different pronation curve behaviors during the running support phase running and there is a tendency to shift to bimodal behavior with an increase in running speed.