Then Sami talks about how hard the first workout is, and how Bob and Jillian are dying to get their hands on the contestants. But everyone's going to have to wait, because instead of working out tonight the contestants will compete in their very first challenge. Let the collapsing begin! Arthur conjectures that a team or two might be going home as a result. Bob and Jillian are dismissed, and everyone else looks kind of worried. The contestants head to their first challenge, which entails colorful treadmills set up outside. Sami says that tonight's challenge will determine who the contestants' trainers will be. Arthur is momentarily relieved. Then, however, Sami notes that change is in the air, and if the contestants think they're choosing between Bob and Jillian, they're dead wrong. Instead, they'll choose either Bob AND Jillian, or "them." A light shines behind two mystery trainers who, in silhouette, look exactly like Bob and Jillian. Maybe this is a Patty/Cathy thing? The poor contestants are all super confused and upset, as if they need more stress.

Sami says that five teams will be training with the new trainers, and six will train with Bob and Jillian. If the contestants decide to train with the new trainers, they'll get immunity... for FOUR WEEKS! Jeebus. I don't know if even I like Bob and Jillian enough to deny that. Of course, the challenge comes into it. Each team has a manual treadmill, and as a team they have to run a 5K. Really, news just keeps getting worse for these folks. Justin says that he's heard of 5Ks, and always wondered who's stupid enough to show up for one of those. Nice. The contestants can take turns however they want, and the order in which they finish determines the order in which they'll choose their trainers. Jesse says that he loves Bob and Jillian, but if he gets the opportunity he's taking four weeks of immunity. Dan/Don, however, think that the so-called "new trainers" are actually holograms or something and that in fact nobody will be training them. They think this because when they turned to look at the new trainers, they didn't see anything. Ladies and gentlemen, your local police force.