10/07/2026
Five times. Not five percent. Five times.
122,007 adults walked a treadmill at the Cleveland Clinic and were followed for a median of eight years. The least fit quartile died at roughly five times the rate of the fittest group. In the same cohort, low fitness carried more risk than smoking and more than diabetes.
Two things are worth knowing about that number. The comparison group is the top 2.3%, so this is the full width of the range rather than two ordinary people side by side. And cardiorespiratory fitness is the most trainable thing on that list. You cannot train your age or your family history. You can train this one.
Almost nobody has it on paper. Bloodwork, blood pressure, see you next year. None of that reads what the body can actually do.
VO2max is measured with metabolic testing on day one, and on a schedule after that.
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