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Jillian Michaels hates her saggy butt and is scared of 40: Her weight-loss tips

Biggest Loser trainer Jillian Michaels is terrified about turning 40, and hates her saggy butt.
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Jillian Michaels hates her "dimply booty" and is working out hard to get in tip-top shape before her 40th birthday.

"I've never fully loved my booty," Michaels said on the Wendy Williams Show Jan. 20. "It fits in the clothes nicely. In clothes, I can stuff that sucker into a pair of jeans and you would never know. But out of the jeans it just kinda falls .... [it is] dimply."

Jillian, who turns 40 in February, said the big 4-0 scares her because she just doesn't see her as middle-aged.

"It's such a powerful number," said "The Biggest Loser" star. "I'm going, ‘I'm middle-aged! I'm middle-aged!' I'm really trying to breathe and embrace it. And it's kind of shocking, because I don't think of myself as middle-aged."

To combat her fear of 40, Michaels has intensified her workouts to whip herself into phenomenal shape. "I‘m trying to get into the best shape of my life for 40," she said.

Jillian has been doing lots of lunges and squats to firm up her glutes, adding that she changes her workout routine every month to avoid fitness plateaus. Michaels revealed her workout secrets in her best-selling fitness video, Jillian Michaels - 30 Day Shred.

"Usually I'll do one boxing session, one yoga session, two resistance sessions a week," Michaels told Reuters. "I'll also work out with friends and then once a week I'll go for a jog. I change the workout every month, so you never adapt and never plateau."

One thing she won't do is resort to quick-fix fad diets, saying eating well is more important than following specific dietary rules. Jillian doesn't follow a particular diet, but focuses on eating whole foods and limiting processed junk.

"First you're a vegan. Then, you're into the Paleo diet. Now you don't eat wheat," said Jillian. "It's ridiculous! At the end of the day, it is common sense: Don't eat chemicals, eat real foods and don't eat more food than you burn in a day. I have taken hundreds of pounds off people at an extremely accelerated rate practicing that philosophy of counting calories."

Michaels, who has starred on "The Biggest Loser" since 2004, said she still finds training contestants on the reality weight-loss competition incredibly inspiring.

"I could take somebody that is a second away from having a heart attack and in four months I can have them running a marathon," she said. "That's amazing. I would never have thought that was possible 10 years ago."

The 5-foot-2 Jillian, who once tipped the scales at 175 pounds, has successfully maintained her own 50-pound weight loss for over two decades. She reveals her weight-loss secrets in her new book, Slim for Life: My Insider Secrets to Simple, Fast, and Lasting Weight Loss.