November 21, 2015 11:01 AM

Courtesy Russell Bateman

The latest impossible-to-get-into celebrity favorite isn’t a nightclub or restaurant, but a workout.

The Skinny Bitch Collective is an invite-only exercise class started by trainer Russell Bateman. The name may rub some people the wrong way, but that’s okay with him.

“I like making people’s ears prick up, and the name is always going to get attention,” Bateman tells PEOPLE. “I always had a reputation for training lean models in groups, and that led to a girl retorting, ‘Got the skinny bitches today?’ It was born out of that.”

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Bateman says the workout is “more of an experience than a class.”

“It’s raw, it’s evolving, it’s emotional, it’s bonding, and it’s built to make a girl leave the session leaner and stronger,” he says. “No class is ever the same. You will do things you’ve never done before, and experiencing these movement patterns is integral to breaking out of your comfort zone.”

While Bateman did not divulge specific exercises, he said the class often involves interaction with others, and may involve holding hands or being blindfolded.

“Come to it knowing I’ll test your limits,” he says. “If you don’t like it, leave!”

The class is so in-demand, that Bateman has kept it invite-only. If you want to score admission to his VIP classes (Suki Waterhouse and Ellie Goulding are both reportedly attendees), the best way in is through a referral.

“I am picky, and I expect a certain dynamic and unity,” says Bateman. “It’s like a dinner party. You need some intensity and some personality, and at the same time you need to be able to embrace the class. If I don’t like someone or they lack effort, then they won’t be invited back.”

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Gabrielle Olya, @GabyOlya

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