Jillian Michaels is an American fitness trainer, nutritionist, businesswoman, media personality, and author. She is best known for her appearances on the NBC reality TV series "The Biggest Loser," where she served as a trainer helping contestants lose weight. Beyond television, she has hosted other shows such as "Losing It With Jillian" and "Just Jillian," and appeared on the talk show "The Doctors." Born Jillian Leigh McKarus on February 18, 1974, in Los Angeles, she struggled with weight issues in her youth, which motivated her passion for fitness. She trained in martial arts, holds a black belt, and is certified in multiple fitness training programs. Michaels has authored several New York Times bestselling books, launched a popular fitness app, and has developed a successful fitness and wellness business empire. She is also recognized for her work in nutrition and wellness consulting. In her personal life, Michaels is known for being open about her identity and family, having adopted a daughter and having children with her former partners. She remains an influential figure in the health and wellness industry through media, publishing, and product lines.
