"...slow walkers were twice as likely to have a heart-related death as fast walkers..."

Fast walkers more likely to live longer: Study

"'In other words, the findings suggest that perhaps physical fitness is a better indicator of life expectancy than body mass index (BMI), and that encouraging the population to engage in brisk walking may add years to their lives,' said Yates, lead author of the study published in the journal Mayo Clinic Proceedings.

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The study showed that slow walkers were twice as likely to have a heart-related death as fast walkers, even when other risk factors such as smoking and body mass index were taken into account."