Pumped up by their success, the Robinsons start week two with the growing realization that they can do this. Krista used to begin her walk 30 minutes before the rest of the group, but that has all changed.
"Since Saturday of last week I've just been walking with the rest of the group, and I'm toward the back most of the time, but it's much better," she said.
At the final weigh-in, a week later, they lose even more weight. Collin loses five more pounds, and Krista loses another six. The overall weight loss is dramatic – both are down 16 pounds each in just two weeks.
The Robinsons are elated. The entire experience has been a bonding experience for new, close friends, and saying goodbye is hard.
"My concern is we walk through the door of our house... and do we fall back into the same routine?" said Krista, questioning their continued commitment. "And that's what we need to nip in the bud. That's going to be the hardest part, maybe that first couple weeks at home."
"Nightline" sent them home with a camera to document their journey. The first step was getting rid of all the unhealthy food in their kitchen.
Both Krista and Collin said tossing out the junk food was unexpectedly liberating, and made them feel in control. They re-stocked their cabinets with low-fat options they learned about at camp, and kept up with daily exercise.
Five weeks after camp, "Nightline" caught up with the Robinsons to check in on their progress. Their changes were staggering. Collin had lost 27 pounds total. "I feel like I can do more now. There's not as much holding me back from what I wanna do ... I can just go out there and play basketball for an hour, but also, I can go out there, meet, like, a group of people and play basketball with them and not feel embarrassed."
Krista had lost almost 33 pounds. "It's incredible," she said. "I'm really inspired by Collin, but we get out and we walk every morning, or most mornings. We have very low-fat foods for the most part. I think probably four days since we've been home, we went over 20 grams of fat a day. Some days we only eat about 1,000 calories."
"She's had a lot more energy since we came back from the camp," Collin says about his mother. "And she wants to get out and do more."
Collin revealed that having an overweight mom used to worry him deeply. "I was worried she wasn't going to make it until she could lose the weight, but I tried not to think about that," he said.
All those dire health fears are gone now; instead, there's a newfound sense of confidence, and an even bigger sense of pride.
"I am very proud of her for losing all that weight," said Collin. "I'm also pretty proud of myself."