Spc. Patricia Mathis, 506th Quartermaster Company, 18th Combat Sustainment Support Battalion, 16th Sustainment Brigade, does push-ups during the Army physical fitness test portion of the 3d Expeditionary Sustainment Command's "Sustainer Challenge" at Joint Base Balad, Iraq, March 18. Mathis, a native of Philadelphia, Pa., said it is important to challenge yourself. "Do not be terrified and do not be discouraged," said Mathis. "Just have faith in yourself and you can accomplish anything you put your mind into."