At Pajamas Media, Dalrymple takes issue with a paper in the Lancet that concluded that “every additional 15 minutes of daily exercise beyond the minimum of 15 minute per day further reduced all-cause mortality by 4 percent”:
The subsequent letter to the Lancet pointed out that this cannot be correct: for if it were correct, and on the assumption that the relation between exercise and longevity were a causative one, Man would be immortal if only he did sufficient daily exercise, something in the region of six hours. In these circumstances, at least in my opinion, life would not actually go on forever; it would merely seem as if it did, in the sense of being boring and pointless.
Read it here