On 2 October 2004, a man went down to his local park in London with some friends.  What they did there would change the world.  Although they didn't realise it at the time.

That day, Paul Sinton-Hewitt organised the first ever parkrun event. 13 people ran around a 5k course, and five people volunteered.  Twenty years later parkrun is a registered charity and  a global phenomenon.