Now that the contestants' partners are back at the ranch, those who've been working out at home will weigh in and see how they have fared away from the ranch. A visit to Dr. Huizenga will reveal the contestants' new "real age" and how far they've come in the first five weeks. Then all the players compete in this week's "rope challenge," and later, an elimination leads to tension on one team when one player thinks her partner hasn't been pulling her weight.

It's the 100th episode of The Biggest Loser,and this week, a balancing competition will bring the winner a coveted prize - a 24-hour visit from a loved one back home. Then the teams all take part in a tough challenge that tests their endurance, and later, one player will be sent home from the team that falls below the dreaded yellow line.

This week, the contestants hike up a hill to find over 100 keys, but only two teams will find the keys that unlock the Biggest Loser gym. The rest of the teams have to learn to creatively work out all week without the use of the gym. Later, a rowing machine challenge pits team against team, and then a surprising turn of events leads to one contestant heading home.