[gchamonlive]

Correlation can arise without necessarily having a cause and effect relationship. In this case it is quite plausible to have a correlation between longevity and cold showers, but that could be because people prone to cold showers are also more likely to face discomfort and lead more active lives, which in turn has direct correlation with a reduced risk of heart disease and diabetes. Then the point changed entirely, where once the focus was on the showers, now it is on something far deeper, like the hability to be comfortable with discomfort.