James Hibberd
September 14, 2011 AT 05:21 PM EDT

Not only is NBC having the weight-challenged Biggest Loser crowd run another marathon this season, but, for the first time, the runners will include eliminated contestants. At stake: A spot in the finale.

The premiere will have 15 contestants, divided by age, race across the desert for the chance to choose the trainer they want (Bob Harper, Anna Kournikova, or Dolvett Quince). They will all return to the same spot in the desert near the end of the season for a chance to be in the finale by running 26.2 miles — whether they’ve been eliminated or not. The show returns Sept. 20.

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