Reality TV Magazine - Scottsdale, AZ, USA - It’s not unusual to see the Biggest Loser “Black Team” trainer, Jillian Michaels, lose her cool during a workout. However, this week Michaels stunned audiences when she seemingly lost her temper with host, Alison Sweeney during a pre-weigh-in interview.

During the interview, Sweeney was grilling contestant Brittany about the upcoming weigh-in, when Michaels suddenly jumped to Brittany’s defense, crying, “Have a ^%$&* heart and leave the ^&%$ girl alone!”

What made Jillian lose her temper?

“It wasn’t Ali I was talking to. I was talking to the producers,” Michaels told Reality TV Magazine in an exclusive interview. “They were questioning Brittany throughout the

9NEWS.com - Denver, CO, USA - Do you have a reunion or wedding to attend this summer? Need to whip your body into shape - fast? As seen on the 6:20 Sidebar - AOL Body's Jillian Michaels, strength trainer and life coach for the Red team on NBC's "The Biggest Loser," can help!

She's got a new book called Making the Cut, that has tips to help you develop strength, flexibility and endurance. She told us the key is doing the fundamentals - even something as simple as a stomach crunch - correctly.

She says to keep your eyes on the ceiling the whole time – and crunch

About - News & Issues - New York, NY, USA - NBC has revealed more details about the upcoming season of The Biggest Loser. As previously reported, soap star Allison Sweeney will replace Caroline Rhea as host -- but that's not the only casting news that will have fans buzzing. Trainer Jillian Michaels, who was replaced by Kim Lyons last season, will return to the show in a surprising new twist. She will be joining Kim and Bob Harper.

In other casting news, a set of twins will be competing for the first time. The show will also welcome its oldest contestant ever (age 62).

The new season will premiere on Tuesday, September