The Biggest Loser
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It was originally hosted by Caroline Rhea from 2004 to 2006. In 2007 starting with the fourth season, Alison Sweeney took over as host. In 2015, Sweeney left as host and trainer Bob Harper took over as host for the 17th season that aired in 2016
Bob Harper and Jillian Michaels were the original personal trainers of the show when the show got on the air. Since then trainers such as Cara Castruonova, Jessie Pavelka, Kim Lyons, Brett Hoebel and Anna Kournikova have also trained on the show. The current trainers are Dolvett Quince and Jennifer Widerstrom.