It seemed like a reasonable control group to me. For years it was sort of general knowledge that people who did too much (relative, I know) and not enough or any had similar life expectancy. There was some more general study done in the 80s, if memory serves, that simply looked at the ages of premier athletes at death which look about the same as for sedentary people.
This time, like all times, is a very good one, if we but know what to do with it. Ralph Waldo Emerson
Any given day you are surrounded by 10,000 idiots. Lao Tsu, founder of Taoism