Fit to Fat to Fit, which premiered in January 2016 on A&E, follows 10 trainers as they radically alter their diets and refrain from exercising in order to gain weight over a four-month period. The series pairs trainers with an obese client to begin a four-month challenge to shed the pounds together. Along the way, both the trainers and their clients are monitored closely by physician and provide constant updates on their emotional and physical progress.