Greg took a training session at the Eldon Square shopping centre as part of the launch event.
He won gold at London 2012 long jump and says now it's his turn to inspire others.
More top news
The Sunderland boss Dick Advocaat has tonight left the club.
Plans are underway to transform Auckland Castle into a major tourist destination with the help of a £10 million grant.
A look ahead at the forecast for the Tyne Tees region.