• Dear Mark: Is There No Upper Limit to Endurance Training?

    21 days ago - By Mark's Daily Apple

    Yesterday, I linked to a study showing that the beneficial effects of high levels of cardiorespiratory fitness-the kind you build with cardio/endurance training, HIIT, and sprints-have no upper limit. At first glance, this study appears to bust the “myth” of chronic cardio and the U-shaped curve of endurance training and prove that the more you train, the longer you'll live. This appears to run counter to some of my central claims-that too much mid-to-high intensity endurance exercise leads to burnout, health issues, and diminishing returns.
    A commenter wrote a great comment that got me...
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