The players all gathered outside to hear about this week's pop-up challenge. Ali alerted the teams that the winner of the challenge would be able to stay with their trainer and keep their partner, but the other players' teams and trainers would be determined by a coin toss.
For the challenge, the players had to up-downs in the mud. Each time they got up, they had to touch the disc that was above their heads. First player who touched their disc a hundred times was the winner. The player to come in last place would automatically be split up from their partner. Each team had to choose one player to represent them, except for Dane and Helen, who were each the solo player left on their team.
After Tara and Sione were neck-and-neck in the challenge, Tara reached 100 first, leaving Sione with 99 touches. Tara collapsed in the mud from exhaustion, but Laura was the first one to greet her partner with a congratulations hug. In the end, Helen came in last place, which meant she would switch trainers to Jillian. She was sad to leave Bob's team.
Tara and Laura chose to stay with Jillian's Black team, but the rest of the teams would be determined by a coin toss. It looked like all the players were switching up trainers. When Mike and Ron tossed their coin, it landed on Blue. Because of the Blue team already filling up, that meant the Brown team would split up and have to decide which player would stick with Bob and which would go to Jillian's. Ron decided to switch to the Black team.
After all the teams were determined, Ali told the players to look at their new teams and their new rivals. Cathy and Kristin were happy to stick together and still be on Bob's team, but they were not happy that all their teammates were now on Jillian's team. Bob's Blue team consisted of Kristin, Cathy, Ron, Dane, Aubrey and Mandi. Jillian's Black team had Helen, Sione, Filipe, Mike, Laura and Tara.
Jillian greeted her new Black team and was getting used to some new faces. She couldn't believe how many of Bob's old players were now on her team. She promised open communication with her new players, because she knew it would be hard to adjust to change. She also said the players should embrace the opportunity to be familiar with both trainers while living on the ranch.
When Bob first walked into the kitchen, he was happy to see his team all wearing blue shirts. But, then he realized they were not all the old players he was working with before. Kristin started to tear up when she talked about how she missed her "brothers" that were there before.
The Black and Blue teams ran into each other outside the gym. The reactions were all emotional. Bob started choking up when talking to his old team, who were now with Jillian. Bob was so confused on how to handle the situation. He just encouraged his old team to continue to work hard and he had to learn to push his new team, too.
Both teams met up with Ali to hear about the new challenge, a challenge that would last 24 hours. Each team had a stationary bike and for that time period, each player had to work as a team to clock in as many miles as possible. The winning team would get a three-pound advantage at the next weigh-in and each winning player would get their own state-of-the-art track bike.
Both teams agreed that they could finish the challenge strong and both did. When the 24 hours was up, Ali broke the news that the Black team had won the challenge and Tara had ridden the most out of all the players. The Black team celebrated with hugs and cheers. Ali told the teams they finally could catch some sleep and they were relieved.