AJ is seen by many as Australia's weightloss queen and has been an inspiration to many Australians wishing to lose weight. AJ weighed once weighed 110kg and lost 48kgs in 18 months. AJ is a single mother, with a five year old son "Kia."
AJ is best known in Australia as being the author of several books including "Confessions of a Reformed Dieter" and the subject of a documentary "Larger Than Life."

AJ is now the host of Network Ten's "The Biggest Loser." AJ also is a stand up comedienne and public speaker outside of her television role. She has previously had a guest spot on Triple M and has been the subject of an A Current Affair story in 2004.

Bob Harper is one of America's most famous and favourite personal trainers. Bob has been involved with two previous series of The Biggest Loser, both times training the blue team.

Bob is now the blue team trainer on Australia's first series of The Biggest Loser.

Since starring on The Biggest Loser, Bob has authored a book entitled "The Biggest Loser: The Weight Loss Program to Transform Your Body, Health and Life" which has been a US best seller.

Bob has trained many celebrities into shape including Jenny McCarthy, Guy Ritchie, Ben Stiller, Ellen DeGeneres, Gwyneth Paltrow and Melissa Etheridge.

Jillian has been involved with two previous US seasons of The Biggest Loser.

Jillian is the co-owner of the "Sky Sport Spa and Fitness Club" in Beverly Hills, California. Jillian is also the author of several books including "Winning by Losing, Drop The Weight, Change Your Life." She has also created a range of workout videos.

Jillian has a black belt in Akarui-Do and has seventeen years experience in martial arts.

Jillian has also lost 50 pounds (22.6 kgs) in a weight loss achievement some years ago. Jillian knows how it feels to be in the contestants shoes.

Jillian has been the red teams trainer for the two previous series of the NBC hit "The Biggest Loser" and now is the red trainer for Network Ten's "The Biggest Loser."