When a tiny radical of runners gathered connected a chilly autumn greeting successful London 20 years ago, no-one could person realised they were taking portion successful thing that would go an planetary hit.
Green Day's medium American Idiot had conscionable reached fig one, Ben Stiller's Dodgeball was showing successful cinemas and the archetypal bid of Strictly Come Dancing had conscionable finished.
Organiser Paul Sinton-Hewitt enticed the pioneering 13 runners to crook up to what was past known arsenic the Bushy Park Time Trial connected 2 October 2004 aft wounded prevented him from taking portion himself.
"It truly affects people's lives truthful that goodness that exists successful a parkland connected a Saturday greeting extends to the full week," helium says of an lawsuit with millions of play participants and volunteers.
For the uninitiated, Parkrun sees radical of each ages and abilities stitchery successful an outdoor abstraction astatine 09:00 connected Saturdays and tally for 5km - oregon conscionable implicit 3 miles.
Shorter 2km runs for children aged 4 to 14 and their families instrumentality spot connected Sunday mornings.
By Christmas of 2004, the numbers had doubled and by the clip of the 2012 Olympics the lawsuit had expanded to each London borough.
Last month, Lithuania became the latest state to big a Parkrun, taking the wide tally of nations to 23.
Ireland is the astir fashionable spot for Parkrun worldwide - wherever betwixt 8-9% of the colonisation are registered.
In London, wherever it each began, determination are present astir 750,000 registered parkrunners (including Greater London) and astir 100 events each weekend.
Born successful Zimbabwe but raised successful South Africa, Mr Sinton-Hewitt was given a CBE for services to grass-roots athletics participation successful 2014.
Now happily surviving successful agrarian Sussex, helium says "you get absorbed by the community, who marque you consciousness special".
He said: "Almost each the radical I cognize person recovered that it's truly welcoming.
"It's non-competitive. You tin tally it arsenic hard arsenic you like. You tin beryllium arsenic competitory arsenic you similar but you're not truly competing with different people.
"You're competing against yourself, and arsenic a result, there's this unit is taken distant and it's conscionable fun, right?"
Parkrun: In numbers
10,000,000: Registered Parkrunners
900,000: Volunteers
2,500: Parkrun locations
2,000: GP surgeries linked with Parkrun
25: Parkruns successful prisons and young offenders institutions
23: Countries wherever Parkrun takes place
Source: Parkrun
Six years ago, Afe Komolafe was pre-diabetic and started doing Parkrun adjacent her location successful Hayes, westbound London.
The assemblage engagement serviceman fell successful emotion the play lawsuit and, aft a little interruption owed to a genu injury, she present accompanies first-timers and adjacent travels overseas with friends made astatine events for her Parkrun fix.
She said: "Parkrun means a full batch to me. It's community, friendship, health, well-being, fitness.
"It's conscionable special. It's tally by volunteers: determination are nary airs oregon graces astir it.
"I've made truthful galore friends done Parkrun."
Nigel Rata, who has a PhD successful atmospheric chemistry, has clocked up much than 200 events and tries to "get a Parkrun successful wherever I am".
The southbound Londoner describes it arsenic a "family".
He said: "There's nary anticipation of what you bash erstwhile you get there. There's nary anticipation of performance... but fundamentally, it's determination for me.
"You'll consciousness large afterwards, nary substance however you consciousness going into it.
"Being with radical being successful the outdoors and getting caller aerial successful greenish spaces conscionable works for me."
For the antheral who started it all, arthritis successful his near genu means helium "can inactive marque my mode astir the course, but mostly it's walking oregon I'm backmost volunteering".
Mr Sinton-Hewitt said: "It helps maine spot the joys successful beingness and and sets my my way retired for the the remainder of the week, truthful it's a precise important portion of my existence."