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The Difference Between Zone Two and Zone Three
With zone one, when you're using fatty acids and oxygen, the mitochondria in your cells are creating the ATP. When we actually cross into zone four, that's where it gets a little fuzzier. The line between zone three and zone four is that some people liken this to the ventilatory threshold too. It's when we get such a high utilization of these anaerobic energy systems that you start to really get steady accumulation of metabolites.