The players train for a marathon at home and must work to stay on track while away from the ranch. During the race, the contestants receive support from former players and family members. Later, Bob and Jillian hold last-chance workouts before the weigh-in, which determines who‘s moving on to the final round.

In the penultimate episode of The Biggest Loser, the final four players are sent home for 30 days to prepare for a marathon. Mike heads Chicago, Daris heads to Oklahoma, and Ashley comes home to Tennessee while Koli opts to train in Las Vegas away from home and distractions. Training home, however, proves to be harder than expected. Daris, for instance, has reverted back to his old eating habits as he indulged in a midnight binge. On the other hand, Mike and Ashley turn to each other for backup.
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