This study compared the center of mass behavior and muscle activation patterns during Chi running and normal running. The study included 10 participants, both male and female, who were recreational runners training at least 5 days a week. Thirty-second trials were collected continuously on a treadmill in the University of Texas Non-linear Biodynamics Laboratory. The variables being examined were the COM vertical position and COM acceleration in the A/P direction, the angle of lean, the gravitational moment about the ankle, and EMG amplitude and duration from four leg muscles. Although no significant differences were found between the two conditions for any of the dependent measures, there was a visible change in running form. A larger number of participants or a different set of dependent measures may be required to observe statistically significant differences. / text