'Are You There God? It's Me, Margaret' Star Got a Bust Exercise 'Master Class' from Judy Blume

"We must! We must! We must increase our busts!"

We imagine that countless Judy Blume fans tried to picture the infamous exercise after reading Are You There God? It's Me, Margaret. But when the film adaptation dropped in April, readers finally got to see how it's done. And according to Abby Ryder Forston, who plays Margaret, the cast couldn't have done it without Blume's help.

While chatting with PureWow, the 15-year-old actress walked us through how she and her fellow cast mates, Elle Graham, Amari Alexis Price and Katherine Kupferer, learned the proper way to do the bust exercise.

In case you need a recap of the scene, Nancy encourages her friends to follow a special "technique" that'll help them get out of wearing smaller bras.

While discussing the scene, Forston told us, "We were rehearsing the scene where we're in Margaret's room, and all of the girls are doing the 'must increase our busts' exercise after they look at the Playboy, and we were rehearsing it. And apparently, Judy was talking to Julie, one of the producers, and was like, 'Oh, no, I have to stop them. They're doing it wrong. I have to show them how to do it.'"

abby ryder fortson interview
Unique Nicole/GA/The Hollywood Reporter via Getty Images

Blume then took the reins and demonstrated the right way to do it. Fortson said, "She took us behind the set and gave us a master class in how to do the 'I must increase our bust' exercise, which is the most iconic thing you can ever be taught by Judy Blume."

She added, "That was very fun and we're all very glad that Judy Blume was on set that day. Because without her expertise, we would have been doing it completely wrong."

As it turns out, the girls were initially trying it the way that Kelly Fremon Craig, the film's director, always interpreted it. Blume noted in an interview with Good Morning America, "That's the way Kelly did it when she was growing up. Nobody told her the right way."

Major kudos to Blume for setting it straight.

FYI, Are You There God? It’s Me, Margaret is available now on Digital and On Demand, and on Blu-ray and DVD July 11 from Lionsgate.

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Nakeisha Campbell

Associate Editor, News and Entertainment

Nakeisha has been interviewing celebrities and covering all things entertainment for over 8 years, but she has also written on a wide range of topics, like career...
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