Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    Personal trainer Drew Manning, a self-proclaimed fitness addict, started a weight-gain journey about a year ago to better understand what his overweight clients go through. He let himself go completely and chronicled the process on his website, Fit2Fat2Fit.com. Shown here is what Manning's body looked like when he started his journey.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    Drew Manning is a medical technician by day and a personal trainer in his spare time. When he started his experiment on May 7, 2011, Manning had a 34.5-inch waist and 17-inch neck, and he weighed 193 pounds. Shown here is Manning at week 4, when he weighted 216.5 pounds.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    To gain weight, Drew Manning stopped working out and started eating fast food and drinking soda. He then saw why his overweight clients were sometimes frustrated. "I thought I was just going to get love handles, man boobs, a big gut and then I would lose it all," he told "Nightline." "Complete opposite. Very, very hard." Shown here is Manning at 222.3 pounds in week 7.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    Drew Manning documented his progress with a weekly blog. As the weeks progressed, his confidence and his health took a downturn. Manning became winded easily, and his glucose level and blood pressure were high. "My kidneys were those of an alcoholic, my doctor said...because of all the soda I was drinking. I don't drink alcohol," Manning said. Here he is at 250.2 pounds in week 16.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    Drew Manning's weight gain also took a toll on his joints and he started to swap his fitness addiction for a food addiction. His wife Lynn said her husband became "lethargic, lazy, not helping around the house" as he gained more and more weight. Shown here is Manning at 256.9 pounds in week 20.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    Lynn Manning said she was prepared to see her husband's physical changes, but didn't expect the emotional and personality changes. "He didn't want me to see him naked because he was so self-conscious about everything," she said. Six months after starting his experiment, Manning had gained 72 pounds. He had a 48-inch waist, 19-inch neck and he weighed 265 pounds. Shown here is Manning at week 24.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    Drew Manning said he began feeling inadequate as a husband and as a father to his 2-year-old daughter. "It broke my heart seeing her cry because I couldn't play with her," he said. Manning ended the weight-gain experiment last fall and started the process to whip his body back into shape. Shown here is Manning at 231.1 pounds in week 36.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    When he launched his battle back from fat to fit, Manning said one of the big challenges was re-teaching himself to eat healthy again after being on a junk food diet. "I went from Cinnamon Toast Crunch to a fiber cereal and it tasted like dog food," he said. "It was weird how in my mind it changed. It didn't taste as good." Shown here is Manning at 212.4 pounds in week 44.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    Hitting the gym, once a passion for Drew Manning, filled him with dread. He said his body went through "hell" to lose the weight. "Headaches, moody, grumpy, feeling starved in a way, even though I was eating 2,000 calories a day," he told "Nightline." "Going from 5,000 to 2,000 is a big change." Shown here is Manning at 201.7 pounds in week 48.
    Courtesy Drew Manning
  • Drew Manning's Dramatic Transformation

    A year after launching the "Fit2Fat2Fit" experiment, Drew Manning weighed 190 in the end. Shown here is what he looked like at week 52. Manning said part of his motivation came from the enormous online following he developed through his blog entries. His story was retold in his new book, "Fit2Fat2Fit: The Unexpected Lessons from Gaining and Losing 75 lbs on Purpose."
    Courtesy Drew Manning
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