A book by former UFC fighter Chael Sonnen, offering his uncensored thoughts and insights, likely covering his career, fighting philosophy, and experiences in mixed martial arts.
Like Chelson Sun has talked about this extensively.
""Joe Rogan mentions Chael Sonnen (referred to as 'Chelson Sun') discussing the difficulty of maintaining peak physical condition for MMA, implying his expertise and insights on the subject, which he has shared in his writings."