Jillian Michaels (born February 18, 1974) is an American personal trainer, businesswoman, author and television personality from Los Angeles, California. Michaels is best known for her appearances on NBC's The Biggest Loser and Losing It with Jillian. She is also known for her appearance on the talk show The Doctors. In Fall 2015 she will host and co-judge a new series on SPIKE TV titled "Sweat, INC". Additionally in January 2016 her new docu follow series "Just Jillian" will premiere on E!