Dutch TV: "Why runs half of the Dutch population?"

On one of the public networks the program 'Grim' tried to answer the question "Why is the half of the Dutch population running?". The presenter takes part in a halfmarathon in Leiden after only 5 weeks of training. During the program he talks to the Dutch writer Dirk van Weelden who also writes about running, a 63 year old lady that has run well over 100 marathons and various other runners.
For those who like to see the program: it is also avialable on the internet (of course only in Dutch and no subtitles :-(