Jillian Michaels, 38, had spent two years away from NBC's The Biggest Loser when she was inspired to return after attending a Madonna concert with fellow trainer Bob Harper, 47.

"When are you going to play 'Holiday'?" she remembered thinking, according to a report from the Hollywood Reporter. "Biggest Loser is sort of my 'Holiday.'" She added that she missed working with the cast and crew, including Harper, and was "inspired by how excited the public gets about the show."

This season will be different from years past, as for the first time the issue of childhood obesity will be highlighted. Three teens between the ages of 13 and 17 will work with the trainers and will not be eligible for elimination.

Harper said viewers will notice the difference in how the trainers deal with the teen competitors as opposed to the adults. "We do exactly the opposite of what we do with the adults," Harper said. "With adults, we get raw, rough, yelling, screaming up and down. But working with children, it's extremely sensitive. We make sure we are not breaking them down but lifting them up."

Executive producer Dave Broome called this go-round the "biggest relaunch since season one," adding that viewers might be shocked to see in the premiere episode how oblivious families are about healthy eating habits. "They are not educated enough to understand the problem as it relates to food," he said. "It's surprising and shocking."

Catch Jillian back on The Biggest Loser Mondays at 8 p.m. EST on NBC.

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