How do you keep a 16-year-old in sport when he leaves school?
You start by lobbing out a cool £15.5million as mayor Boris Johnson did this week to grease the wheels from education to club or similar, for a start.
The so-called Mayor's Olympic Sports Legacy Plan's details won't be published until next month, but a mayoral office insider revealed the bulk of the money is going to agencies, clubs and such that want to arrest the alarming fall-out in the 16-19 age-group who pack in playing sport when it's not delivered on a school plate.
In west London, that will probably see the likes of Dale Youth Club in North Kensington and Kensington Dragons FC do nicely out of the arrangement.
Dale was the home of Olympic gold medallist James DeGale, and a number of aspiring teenagers have been weaned away from aimlessly leaning on the swings in the local park to swinging left hooks in the club's headquarters underneath the imposing Grenfell Tower in North Ken.
Dragons too, have built up a reputation for developing youth football with potentially difficult children and now boast sides from U11 girls through to senior men playing in the Middlesex League.
But the man who was entrusted to enhance the delivery of sport in Kensington & Chelsea schools as well as forge links with outside clubs and agencies, is fearful the Boris bunce might go in paper-pushing rather than telling moves.
A source close to sports development at K&C believes who didn't want to be named, believes the first thing to be done is to collate a 'sports information pack' for all school leavers.
"How do youknow what is out there with no ready information?" said the source. "I would list all the clubs, agencies, contact numbers etc, so anybody who still wants to swim, play football, run or whatever had the means to do so."
And in the same way universities set up Freshers Fayres, where all clubs and societies set up stalls to entice new students, K&C should do similar by inviting the borough's club and sports set-ups to ply their wares in schools.
"The last thing you want is for this money to be frittered away on bureaucracy," the source added. "The key to success is anything that clears the barriers that sees kids drift out of playing sport because no-one is giving them any direction."