Over the past thirty years, Roger Grimes has been studying Kenpo Karate, achieving the rank of seventh-degree black belt as he also dabbled in several martial arts disciplines. Roger Grimes has also been seeking leadership skills and life lessons to improve his life and character. In cage fighting, he was also seeking learning for improvement, resulting in Lessons from the Cage.

Lessons from the Cage is an inspirational book where Roger Grimes shares twelve life lessons he learned from his three mixed martial arts full-contact cage fights, lessons such as "You Are Not Alone" and "Don't Rush the Process." These life principles can be life-changing if sincerely received and put into practice. In this book, Roger Grimes also shares his experience from the beginning, from behind the scenes, and a detailed story through each cage fight.