Training zones can be expressed in a number of formats and in a number of variations. Some people prescribe 3 zones, others 5, 6, 9 or even 11 zones. At the end of the day, it doesn’t really matter how many zones you use, as long as you know what adaptation(s) each zone is aiming to achieve.
What is VO2 Max?
Your VO₂ max is the maximum volume of oxygen that can be taken in via the lungs, transported via the bloodstream, and utilised by the muscles. It is a key performance indicator for endurance events because athletes with a high VO₂ max value are able to create more energy aerobically and without producing fatiguing metabolic byproducts such as lactic acid.
The human body is a complex piece of machinery, and as such, there continues to be vast research undertaken in an attempt to further understand how it functions. The processes in which the human body adapts to exercise is no different; we understand much of how this occurs, but there is still a lot of assumptions and unknowns to explore.