The problem with five heart rate zones is that precision heart rate calculation can be confusing to the average athlete and critical to the serious athlete. Learning how to calculate you max heart rate zones is time well spent, whether you are trying to learn more about your body and how you respond to exercise or improve upon your sports training and performance.
Fitness goals are assigned to each heart rate zones, lower zones (zone 1 50% to 60%) and (zone 2 60% to 70%) are weight loss zones and low intensity zones. The higher zones, 3, 4, and 5 are used for cardiovascular fitness and improving sports performance.
Here is the real deal, exercising in zones 1, 2, and 3 there is a caloric expenditure of approximately 9 to 12 calories/minute, exercising in zones 4 and 5 there is a caloric expenditure of 13 to 15 calories/minute. The ultimate goal is to eventually train so that it is possible to exercise aerobically in the higher zones for longer periods of time. At this level weight loss/maintenance and cardiovascular fitness can be a definitive result of ones hard work.