For Instagram followers, Julianne Hough displays her enviable six-pack in black leggings and a matching sports bra.

While visiting the UK recently, Julianne attended a Barry's Bootcamp class and posted a photo with her followers.

"Let's go @barrysuk," the caption read. In black leggings and a coordinating black sports bra,

Julianne was astonishingly fit. But in all seriousness, her abs were more amazing than the 'fit—wow!"

Julianne posed with Maude Hirst, an actor who she took the class with.

In the United States, celebrities began to frequent Barry's Bootcamp, especially in Los Angeles

 where celebrities like Kim Kardashian and Carrie Underwood made the strength and cardio interval workout famous.

However, the exercise has gained popularity on the other side of the pond as well, 

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