John McAvoy has transformed himself from one of Britain's most wanted criminals to a Nike-sponsored Iron Man triathlete who advises the government on prison reform and works hard to make sure young people don't make the same mistakes he did. In the latest episode of Modern Masculinity, he speaks to the Guardian's Iman Amrani about his journey from the 'hyper-masculine, alpha male' environment of his childhood, through two life sentences for armed robbery and isolation inside HMP Belmarsh, to his ultimate redemption through sport and the friendship he formed with one of his prison officers