The lead leg should drive upward with the foot crossing up and over the opposite knee. The thigh of the lead leg should be parallel to the track, while the foot is extended forward and the ankle maintained in a dorsiflexed position. The lead leg should swing downward with the foot landing on the mid-foot or ball of the foot. The foot should land under the body while slightly flexing the ankle. This flexion action of the ankle upon foot strike will help propel the body forward. The ankle should then be quickly returned to a dorsiflexed position and the process repeated.