The document discusses the anaerobic energy system and how it can be improved through training. It describes the ATP-PC system which provides energy for up to 10 seconds and the lactic acid system which provides energy for 30-60 seconds. Methods of anaerobic training include interval training, resistance training, sprinting and weightlifting. Physiological adaptations to anaerobic training include increased muscle strength, larger ATP and PC stores, improved power output, and development of fast-twitch muscle fibers. Adaptations depend on the type of training and the individual athlete.