Fit to Fat to Fit is coming to Lifetime. A special marathon of the extreme weight-loss series will air on January 8.

Lifetime revealed more about the planned marathon in a press release. Check that out below.

“The groundbreaking docuseries Fit to Fat to Fit, moves to Lifetime with a six-hour marathon, on Monday, January 8, 2018 beginning at 6pm PT.  The series follows personal fitness trainers on the verge of undertaking the most extreme weight-loss experiment ever: by forcing themselves to gain a huge amount of weight, they aim to better understand the struggles of their obese friends and family as they lose the weight together.

Led by professional fitness trainer Drew Manning, who in 2012 sought to bridge the gap between him and his overweight brother-in-law by purposely gaining 75 pounds to better understand the stigma and difficulties of weight loss, four new trainers embark on Drew’s same challenge. Spouses, friends and sisters in California and Arizona partner up – one of them a personal trainer and one of them who wants to shed pounds – agree to a revolutionary journey of transformation.

Charting each pair’s journey, Fit to Fat to Fit follows the trainers as they gain weight under medical supervision, then rejoin their partner to begin their four-month transformation. At the end of the marathon, it will be revealed whether or not each pair reached their weight loss goals.  This highly emotional and inspiring journey explores the highs and lows of a rigorous, painful process many Americans battle every day.

Fit to Fat to Fit is produced for Lifetime by Renegade 83 and Gaspin Media. Executive producers for Renegade 83 are Steve Rankin, Jay Renfroe, and David Garfinkle. Executive producer for Gaspin Media is Jeff Gaspin. Brad Abramson and Shelly Tatro are executive producers for A&E.”

Will you watch the Fit to Fat to Fit marathon on Lifetime? Tell us what you think.