The women ofHustlersleft it all on the dance floor.

Jennifer Lopez,Constance Wu,Lili Reinhartand the stars of the film, in theaters now, held nothing back when it came to preparing for their roles as strippers who work to get the upper hand on their Wall Street clients. Here are some of the craziest, funniest and most painful ways they got ready for the big screen.

J.Lo’s Pole Dancing Pain

Lopez had to master the pole forHustlers,and a YouTube vlog showed the prep was “just as hard as anything I’ve ever learned,” the actress revealed, pointing out the cuts and bruises on her legs. After shooting her solo pole dancing scene in the club, Lopez, 50, was so proud, she “[felt] like crying.”

Constance’s Christmas Trip

When it came to prepping for her role as a new stripper in the film, Wu took no days off — not even Christmas Eve. “I went to a lot of strip clubs in San Francisco — that’s what I spent my Christmas Eve doing,” Wu, 37, revealed inVulture‘s oral history of the film. “I went with two of my guy friends, and we went to five different clubs. It was so f—– fun. And nobody knew who I was. I’m not really that famous. Also nobody expects this sitcom mother of three boys to be in a strip club.”

STX Films

Cardi B and Constance Wu

J.Lo and A-Rod’s Strip Club Visits

Wu wasn’t the only one who wanted to get in some research before the film. Writer-directorLorene Scafaria toldVulturethat Lopez enlisted fiancéAlex Rodriguezfor strip club trips. “She was able to give me some … insights,” Scafaria said. In order to master the art herself, the actress had poles installed in her homes, her trainerJohanna Sapakie told PEOPLE.

George Pimentel/Getty Images

Jennifer Lopez and Alex Rodriguez

Lili’s Sickening Stunt

Lili Reinhart.George Pimentel/Getty Images

Lili Reinhart

Cardi BFacing Her Fears

The rapper’s heart was “pumping fast” when it came time to shoot the scene where she givesJennifer Lopeza lap dance. “Like, ‘Oh, my God, I gotta rub my vagina on them?’ ”she recalled toAccessof her nerves.“Because that’s how you really give a real lap dance … That’s how you work the clock.” Cardi, 26, who used to be a stripper herself, faced her fears and crushed the performance.

source: people.com