The Biggest Loser Season 16 Episode 7 featured a unique challenge. It was all about a pool.

During this episode of the NBC reality competition, the teams were told to hold a percentage of their body weight in order to keep their trainers from falling into a pool.

What happened to the last place team? It lost its trainer for the week. Ouch! Big stakes, folks!

Meanwhile, a pair of eliminated contestants teamed up at Comeback Canyon; while one contestant gave her trainer a glance back at her past.