Dr Laura Joenssu: Vigorous exercise is accelerating aging

The orthodoxy of exercise science is being challenged, in a study out of Finland. The claim is that vigorous exercise does not necessarily help you live longer, and too much - as well as too little - may even accelerate the ageing process.  The study examined the lives of 11,000 pairs of same-sex twins over a 45-year period. Comparing the different exercise levels of twins showed that whilst exercise can help prevent diseases like type 2 diabetes there was no convincing evidence it lengthened lifespans. In fact, the most active had a biological age1.8 years older than those who were only moderately active.   The studies' author, Dr Laura Joenssu of the University of Jyväskylä joins Jim to explain more.