Abstract: A system and method of detecting head movement during a golf swing includes wirelessly coupled sensor devices at the golfer's head and hand, each including an accelerometer, processor, and communication module. The hand sensor device measures forces at the hand, and the head sensor device measures movement at the head. During a swing, the accelerometer in the hand sensor device measures forces in three directions and generates swing data. The processor in the hand sensor device detects an impact time in the swing data, and that impact time is transmitted to the head sensor device. The accelerometer in the head sensor device continuously measures forces in three directions and generates head data. The processor in the head sensor device processes the head data around the impact time to detect head movement. The processor in the head sensor device then issues an alert if the head movement exceeds a threshold.