May 04, 2015 12:00 PM

Don’t think the Barden Bellas made it to the international stage without some thigh-burning hours in aca-boot camp.

PEOPLE got an exclusive behind-the-scenes look at the song and dance rehearsals for Pitch Perfect 2, which hits theaters May 15.

In the clip, Anna Kendrick, Rebel Wilson, Brittany Snow and the rest of the Bellas are at the studio for the first day of training, alongside their rival a cappella group Das Sound Machine (led by Game of Thrones‘s Birgitte Hjort S rensen and YouTube comedian Flula Borg).

“The music in this movie is particularly challenging, so I don’t want to work people too hard,” vocal producer Deke Sharon says in the video.”I don’t want to snap any vocal chords.”

Also particularly challenging? The dancing, which Snow told PEOPLE is even “bigger and badder” this time around.

“We’re putting them through the ringer. Everybody’s thighs are burning,” choreography assistant Kyndra “Binkie” Reevey says while Alexis Knapp, who plays Stacie, moans and groans on floor of the rehearsal studio.

Prepping for the musical comedy sequel wasn’t for the weak, choreographer Aakomon Jones explains. “This is when everyone’s brain has to be in full effect. It’s a lot of things to think about.”

RELATED VIDEO: Brittany Snow Promises Pitch Perfect 2 Will Be ‘Bigger and Badder’

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