Abstract: A device for improving the performance of a player, particularly the repetitive correct swinging of a club, is preferably attached to a standard club shaft and has a housing containing at least one processor attached to X Y and Z accelerators. The processor is further attached to data storage and a power supply. The processor can further be connected to a radio and/or IR transmitter as well as a visual display means. A plurality of switches are provided to control on/off, mode selection, storage, etc. The visual display can be either an array of light-emitting diodes (LEDs) or a liquid crystal display (LCD) either one of which will display either the path of the club moving through a pre installed “master” swing or a swing derived from sampled swing data.