UETrak (Upper Extremity) is a software designed to calculate three-dimensional upper extremity kinematics for upper body movement measurement. Developed by the Center for Human Performance at San Diego, UETrak calculates joint and whole body kinematics using 3D coordinate data collected from a Motion Analysis system. The kinematic data can also be integrated with lower body measurements. With reliable processing of 3D upper extremity kinematic data, UETrak offers a reliable tool in evaluating various activities involving upper body movement. Such applications include head, trunk, elbow and shoulder motion during a golf swing, baseball pitching, hitting, tennis serve, reaching or gait.