Abstract: A weight shift feedback apparatus senses a weight shift in a golf swing motion of the user, collects, synchronizes and stores the sensed weight shift information, analyzes a weight value applied to each foot of the user with respect to time based on the stored data, and extracts important points of a swing. The weight shift of the user may be evaluated based on an address point, a backswing top point, an impact point, and a point where the weight value applied to each foot has a maximum value, and the feedback information for the evaluation may be provided to the user.

Abstract: A cocking loosening feedback method includes sensing sequential three-dimensional direction information of a golf club and three-dimensional direction information of the arm a user, analyzing the change of an angle between both three-dimensional information with respect to time, generating a cocking loosening evaluation variable based on the difference between the cocking loosening point and the impact point and the difference between the backswing top point and the impact point in the analyzed three-dimensional information, analyzing the evaluation variable based on a predetermined criterion to evaluate the cocking loosening, and providing its feedback information to the user.

Abstract: An X-factor feedback apparatus senses three-dimensional direction information of the shoulder and the pelvis in a golf swing motion of a user, collects, synchronizes and stores the sensed three-dimensional direction information, analyzes the change of angle in the three-dimensional direction information based on the stored data information, extracts a backswing top point in the swing motion, evaluates the degree of twist of the shoulder and the pelvis based on the angle in the three-dimensional direction information of the shoulder and the pelvis at the backswing top point, and provides a feedback to the user.

Abstract: A weight shift feedback apparatus senses a weight shift in a golf swing motion of the user, collects, synchronizes and stores the sensed weight shift information, analyzes a weight value applied to each foot of the user with respect to time based on the stored data, and extracts important points of a swing. The weight shift of the user may be evaluated based on an address point, a backswing top point, an impact point, and a point where the weight value applied to each foot has a maximum value, and the feedback information for the evaluation may be provided to the user.

Abstract: A cocking loosening feedback method includes sensing sequential three-dimensional direction information of a golf club and three-dimensional direction information of the arm a user, analyzing the change of an angle between both three-dimensional information with respect to time, generating a cocking loosening evaluation variable based on the difference between the cocking loosening point and the impact point and the difference between the backswing top point and the impact point in the analyzed three-dimensional information, analyzing the evaluation variable based on a predetermined criterion to evaluate the cocking loosening, and providing its feedback information to the user.