There is provided a source driving method in a liquid crystal display, which applies negative and positive video signals to source lines of the liquid crystal display including a first and second plates and a liquid crystal being inserted therebetween, in which each video signal is applied, with its voltage being divided two phases of polarity modulation and gray scale decision. The negative electrode includes a negative electrode current collector having an irregular surface and a negative electrode active material layer formed on the surface. Activity data may be organized as entries including information on user, application, machine, action, object or document, time, and location. Finally, an internal route to the processor associated with the logical grouping is determined and the packet is sent over the internal route to the processor associated with the logical grouping. The strengthening ribs resist the heat sink to prevent the thermal grease from being pressed against the cover plate. Besides being color coded, each exercise, body region, and muscles used are also labeled.