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The Polarized Split in Training - Is That Correct?
In the past, about 85% of your cordio training should be zone two type work. Now it's closer to 15%. Why? Because every time you train, you're fatiguing different energy systems. You almost earn the high intensity work by building the base for it. So what this ratio really allows you to do is continue developing these low intensity adaptations,. These fat burning enzymes and capito condria.