March 01, 2018 04:00 PM

The Browns stick together.

On this season of Sister Wives, Kody and Christine‘s daughter Ysabel has documented her longtime struggle with scoliosis — and now, she and her parents are tackling the problem head-on. After a recent visit to the doctor, she came to discover that her full-time brace was not helping to straighten her spine. In an effort to prevent her from undergoing surgery, Christine and Kody sign her up for an alternative medicine program in which she attempts to gradually decrease her spinal curve through a series of different exercises.

In PEOPLE’s exclusive sneak peek at Sunday’s episode, Ysabel attends her very first day of training at “scoliosis bootcamp,” where she must learn to create muscle memory to straighten her spine. (Her spine is currently at a 42 degree curvature, and surgery is recommended at 50.)

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“On some days, I just want to get the surgery,” Ysabel confesses. “Because I just don’t want to deal with it anymore — I just want to get it over with.”

But she doesn’t give up. After meeting with Dr. Mark Morningstar, a chiropractic physician, Ysabel begins tackling all of the different exercises with newfound determination.

Ysabel (left)

“Right now, Ysabel’s body knows how to make a curvy spine,” mom Christine explains. “Bootcamp is all about retraining the body to stop curving the spine.”

“I’ve never seen Ysabel be particularly athletic, but I do know she is stubborn,” says Kody’s second wife Janelle. “I remember even as a little kid, she would give Christine hell because she wanted Kody around. She had a pretty strong will, a force of will. So I think she might be able to pull it off, even if she hasn’t really been that athletic.”

“We are a family of doing,” Kody adds. “Rather than just sit and wait for something to happen, do something to try and solve the problem. And that’s what we’re doing.”

Sister Wives airs Sundays (8 p.m. ET) on TLC.

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