The study can be found in the 'Journal of the American Medical Association'.
It was conducted by the National Institute on Aging, the National Cancer Institute.
And the Centers for Disease Control and Prevention (CDC).
Quadriplegic ex rugby player raises money by climbing 'Everest' up stairs
Reuters - Sports
Ed Jackson raises over 41,000 pounds scaling 5,566 flights of stairs with 89,058 steps on one working leg in four days.
