An apparatus for training an athlete. The technique comprises providing an index; comparing a first event with the index; determining whether the first event is unusual; and determining whether a security incident associated with the first event has occurred. As a result, the effective capacitance of the bit lines can be significantly reduced during the memory access. To determine the node voltages for other signals, the first order transfer function of the equations is taken and then calculated for the predetermined input. Each control unit outputs the control data once per segment. The coupling assembly comprises a rotatable positioning block having a first surface, and a biasing spring having a second surface, the second surface generally facing the first surface, and the biasing spring adapted to exert a force toward the positioning block when compressed.