Jillian Michaels (born February 18, 1974) is an American fitness expert, certified nutritionist, businesswoman, media personality, and author. She is best known for her appearances on NBC series such as The Biggest Loser. She has also made an appearance on the talk show The Doctors. In 2015, she hosted and co-judged a series on Spike titled Sweat, INC. In 2016, her reality television series Just Jillian premiered on E!.
