Bob Harper and Kim Lyons are personal trainers assigned to help the competitors. Jillian Michaels was a personal trainer for the first two seasons and the special editions, but was replaced with Lyons for season 3. The reason for her departure, according to an interview in WHO magazine, is that she was unhappy with how she was portrayed. Kim Lyons and Bob Harper are back for season 4 with Kim training the Red Team and Bob training the Blue team. Jillian is currently (February 2007) appearing in the second season of the Australian show with Bob Harper. The Biggest Loser got its start in the United States on NBC and is entering a fourth season; the franchise has since been exported to Australia (2 seasons), UK (2 seasons), Netherlands (4 seasons), Brazil, India, and Israel. Internationally, there have been a combined total of about 200 Biggest Loser contestants ranging from 167 pounds (75.8kg) to 477 pounds (216.3kg).

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