Examples in which advanced technologies from computer science are used to provide feedback on sports performance are presented. A game analysis system for table tennis has been developed. After acquiring game relevant data, scenes selected according to different filter functions may be displayed sequentially using digital video. Players, coaches and evaluators may then discuss and analyse these scenes and draw their conclusions. Immediate acoustic or optical feedback on the position and/or quality of the ball just played may be given to the players in training. Eye tracking systems may be used to track eye movements of table tennis players. They allow to determine fixed positions and not fixed areas. A feedback system for rowing analyses the performance of athletes on a rowing ergometer. Different biomechanical parameters (ground reaction forces, position of the sliding seat and handle force) are recorded, processed and visualised. Systems based on small active sensors allow to track the position of freely moving objects within a local bounded three-dimensional area. They may be applied in team sports such as soccer. Informations relevant for training are obtained. Head-mounted displays enable the golfer to observe his/her golf-swing. Empirical investigations indicate that novice players benefit from this method. Multimedia tools for visualising characteristics of individual movements assist golfers to improve their technique.
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