Head On: An All Black's memoir of rugby, dementia, and the hidden cost of successCarl Hayman, All Black #1000, once the most highly prized player in world rugby and a giant of the game in every sense someone who was always respected, even feared. But at the end of seventeen years as a professional rugby player, the last eight played with the sole aim of setting up his family's future, Hayman's life began to unravel in nightmarish fashion. Head On is about the pressures on the modern athlete, where physical performance and commerce