Patent US 8,092,381

A system for increasing the fitness level of a fitness enthusiast. The system includes a personalized set of intensity zones corresponding to increasing levels of exercise intensity. The personalization of the system is accomplished through determining a threshold level based on oxygen consumption or a numerical rating of perception of effort or lactate or metabolism that is unique to each individual. From this determination, an anchor point is created upon which the heart rate values for each of eight zones is based. Each zone corresponds to a multiplier that when factored in to the amount time spent in each zone by the individual, yields a total training load value.