She's intense, relentless and uncompromising as a fitness guru but considering Jillian Michaels' 18 years of martial arts practice, contestants on the Australian series of The Biggest Loser will think twice before complaining. Along with fellow American trainer, Bob Harper, Jillian returns to The Biggest Loser in Series 3 as part of one of the biggest twists the show has seen.

Jillian worked tirelessly to become an expert on all facets of physical fitness, adding to her knowledge of martial arts, like Muay Thai and Akarui-do, by studying nutrition and mainstream training methods. While her obvious strength is an ability to get fast results with popular methods such as weight training, kickboxing and Pilates, Jillian has developed into a renowned all-rounder, even publishing her first book last year: "Winning by Losing; Real Weight Loss for Real People".

Customising techniques at her famous sports and fitness club in Beverly Hills, Jillian caters for busy professionals by developing fast, intense workouts. Her impressive single-minded pursuit of each client’s goal has won her acclaim and attracted high profile celebrities, all seeking the unique and comprehensive transformation that Jillian inspires. Having perfected a rare ability to help clients achieve quick victories over their weight problems and dangerous eating habits, Jillian is perfectly suited for The Biggest Loser format - a race against time for impressive results.

Jillian's reputation as a tough taskmaster and her 'cruel to be kind' approach achieves the kind of results the contestants desire. To Jillian Michaels, failure is not an option. This year's Biggest Loser contestants won't know what they are in for where Jillian is concerned.