PURPOSE: The control of the center of mass (COM) of the body may have implications for injury and performance in athletes. This study aimed to identify potential factors that modulate the COM during an agility task. METHODS: Fifty college (n = 28) and high school (n = 22) female soccer players had the displacement of retro-reflective markers placed over select bony landmarks recorded using a 20-camera motion analysis system while performing a modified T-test. Using the transverse plane positional histories of the markers, the peak change in the linear momentum vector (ΔLMV) of the COM of the pelvis and the angle (ΔLMVA) it formed with the laboratory X or Y axis entering and exiting the two 90 degrees turns performed at the center cone were obtained. The step pattern and extremity used to make the turns were determined. A linear mixed model was used to compare the effects of turn number, limb, step pattern and playing level on the peak ΔLMV and ΔLMVA. RESULTS: An effect (p < .01) of turn number on the ΔLMV and ΔLMVA were noted. The ΔLMV entering turn 1 and 2 was -66.5 (± 3.5) and -8.7 (± 3.5) kg*m/s, respectively and exiting turn 1 and 2 they were 32.9 (± 3.4) and 40.8 (± 3.4) kg*m/s, respectively. The ΔLMVA entering turn 1 and 2 were 6 (± 2) and -24 (± 2) deg, respectively and exiting turn 1 and 2 they were 56 (± 2) and -67 (± 2) deg, respectively. An effect (p = .03) of step pattern on the ΔLMV exiting the turn was noted. The ΔLMV was 42.4 (± 3.8) and 34.1 (± 3.1) kg*m/s, for multi-step and single step patterns, respectively. Playing level and leg dominance did not influence the ΔLMV and ΔLMVA. CONCLUSIONS: The initial inertial state of the COM appears to be the primary factor affecting the control of the COM entering and exiting a turn. When exiting a turn, the step pattern used entering the turn appears to also affect the control of the COM.