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Those who win a particular challenge are given special privileges, such as a weight advantage for the next weigh-in or even full immunity from being voted off the show.
Each week culminates in another weigh-in to determine which team has lost the most weight for that week, in percentage of total weight lost.
Other episodes allow for the contestants, if successfully meeting a goal at the weigh-in, to all receive immunity for the week.
When the number of contestants has shrunk to a predetermined smaller number (unknown to the contestants), the teams are dissolved and the contestants compete one-on-one against each other.
The season finale features both the contestants remaining on the show and those sent home early; the latter are brought back for the final show.
Each season of The Biggest Loser starts the 30-week competition with a weigh-in to determine the contestants' starting weights, which serve as the baseline for determining the overall winner.
The contestants are grouped into teams of three, each wearing separate colored T-shirts.