This tool determines specific exertion levels based on an individual’s functional threshold power (FTP). FTP, measured in watts, represents the highest power output a cyclist can sustain for approximately one hour. The derived zones provide a framework for structuring training, allowing cyclists to target particular physiological adaptations. As an example, a cyclist with an FTP of 300 watts might have a zone 2 power range of 150-180 watts, designed to build endurance.
Employing these zones allows for more effective training compared to relying solely on heart rate or perceived exertion. It offers a direct measurement of work performed, leading to enhanced specificity in workouts and more accurate monitoring of progress. Its usage has evolved significantly alongside advancements in power meter technology, transitioning from elite-level application to becoming increasingly accessible to amateur cyclists seeking performance gains.