Although aimed at the primary demographic of 25 to 55-year-old women, The Fire Within encourages all to benefit from its contents, especially those who have been branded with genetic or thyroid conditions by uneducated doctors. Models, professional athletes, and Fortune 500 CEO's have succeeded with the information supplied in this book, which concludes with numerous testimonies affirming its merit.

Matt Hackney is currently the Official Sports Nutrition Coach for the Lingerie Football League. The University of California has endorsed Hackney's certification program—students at UCSB can receive college credit for completing his fitness program. In addition, Hackney has authored other articles in twenty different publications ranging from National Geographic Adventurer to Life Magazine and currently assists the nonprofit organizations Water for Africa and Dancing Kids.