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Once this is accomplished the system’s new level of function may be maintained for several weeks with stress at the same level of intensity and for a similar duration but with far less frequent training stress. The way to cause any physiological system to become more fit is to stress it regularly with an appropriate level of intensity for an appropriate duration until it has reached an optimal level of adaptation. Sports such as triathlon, road cycling, mountain biking and distance running are first and foremost dependent on the aerobic system-composed primarily of the heart, lungs, blood and the muscles’ aerobic enzymes. Of the basic abilities, the most critical for endurance athletes is aerobic endurance. Summer races are won with winter training. Excellent general fitness created in the base period is necessary to produce high levels of sport-specific fitness for later in the season. If these abilities are fully formed then the more advanced, race-specific abilities of muscular endurance, anaerobic endurance and power may be built on this solid foundation in the specific-preparation (“build”) period. It’s then that the fundamental abilities of aerobic endurance, force and speed skill are developed. An important lesson every competitive endurance athlete eventually learns is that the general preparation (“base”) period of the season is the most important time of the year.