Move and stay young! Did you know that muscles respond to vigorous training with a noticeable and rapid improvement in the ninth decade of life. Today Ian Oliver, the renowned 63-year-old boxing trainer and author of the bestselling book The Fitness of Boxing, invites you to get fit and fit well into your 90s. 'Get fit and stay young! Did you know that 'muscle responds to vigorous training with marked and rapid improvement into the ninth decade of life'. Now Ian Oliver, renowned 63 yr old boxing trainer and author of the bestselling 'Boxing Fitness', invites you to get fit and stay fit well into your 90s.