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Watch Fit to Fat to Fit online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

A&E Network presents a groundbreaking new series that follows personal fitness trainers from across the country as they undertake the most extreme weight-loss experiment ever: by forcing themselves to gain weight, they aim to better understand the struggles of their obese clients as they lose the weight together.