You can really turn this into a positive," says McAvoy who broke world records on a rowing machine and turned his life around in 10 years in prison. John McAvoy is the ultimate example of the impact that sport can have on someone's life.
When he was 24, the Londoner was sentenced to life in prison with no parole for five years after his second conviction for armed robbery. One of those years was spent in solitary confinement.
He broke three world records while behind bars and, after being paroled in 2012, took to triathlon and became a professional Ironman, having realised he was too old to make it as an Olympic rower.