Posing nude might be nerve-wracking for many women, but it’s probably a little less intimidating with a body like famous TV trainer Jillian Michaels. The 40-year-old covered Shape magazine for the fourth time in her career and flaunted her toned physique.

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“I won’t lie. This birthday was hard. I thought, ‘Oh, my God, am I halfway through my life?’ But when I think back on my 20s and 30s, I look better now than I ever have,” said Michaels, whose birthday is on Feb. 18. “Yes, I’m older, but I’m also wiser, and that’s a more intrinsic type of beauty.”

Yet, the Biggest Loser coach – who also posed tastefully nude on the inside pages of the July/August issue – revealed that her body isn’t perfect. She said she’s just learned to embrace every imperfection.

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“We all store fat somewhere. Some of us are proportionately balanced, some are apple-shaped. Me? I carry all my weight in my lower body. No matter how lean I get or how many squats or lunges I do, I always feel like my butt carries extra weight,” she said.

“But what I finally realized is that you can’t have it all. Do I want a better butt? Sure, but I’m healthy and can wear my skinny jeans, and that’s good enough!”

She also offered a little bit of advice to other females: “It’s important for women to have overall strength, because when you feel physically powerful, it transcends into every facet of your life.”

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