Poor cardiorespiratory fitness is closely associated with a significantly higher risk of mortality. Yet many people attribute low fitness to a lack of athletic ability or not having enough time to exercise. Others believe that as long as they don’t have obvious health issues, there is no need to intentionally make time for physical activity.
However, a study published in JAMA Network Open examined the cardiorespiratory fitness of about 122,000 adults using treadmill exercise tests and compared all-cause mortality risk across different fitness levels. The results showed that, compared to those with the highest fitness levels, those with the lowest fitness had an approximately five times higher risk of death after risk adjustment.
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