Why is it that cardio machines lost the anaerobic heart rate zone after the aerobic processes when we known that in resistance training it is the other way around?

https://imgur.com/0hy14if

About Robert Zinn

Robert Zinn, M.D., Ph.D. is a medical doctor, physician, and web entrepreneur, who, for over 15 years was employed by academic and research institutions and focused his clinical practices on very specialized patient populations, such as those with rare genetic diseases or rare cancers. He shares his knowledge through his website, NutritionTheory.org

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