Exercise and life expectancy
-- Croft and Palmer, The Lancet, Volume 379, Issue 9818, Page 800, 3 March 2012.
colleagues claim that exercising for 15 min per day results in a 14% reduced risk of all-cause mortality...
This cannot be true, however, since the risk of mortality is an absolute. The risk can be postponed, but it cannot be reduced, as Wen and colleagues claim, and nor can it be eliminated. In other words you can run faster, but you arrive later.