There were 2 articles in the BMJ this week about longevity and Olympic athletes. One of them  found that those who won medals lived several years longer than those in the general population and longer than other athletes. One assumption was that this is linked to fitness, but that is probably unlikely. Another study also published in the BMJ this very week found that high intensity exercise does not give a survival advantage . I suspect that in fact the increased longevity comes from feeling better about themselves, which will do all kind of positive things for our immune system and overall health.