There are six contestants left—and no more teams. Everyone is wearing the same uniform now. That means they also have to hold themselves that much more accountable for every minute, every rep, every calorie, every challenge, every pound if they intend to stay any longer. Just when you think they've been pushed to the brink, think again. This burn is going to turn into an inferno.

The final four contestants revisit a fitness milestone to see how much progress they have made.