All of the girls' hard work is put on the line as they compete in Boston for a spot on the National Gymnastics team.

While Kaylie's gymnastics career continues to soar, she struggles to help Payson deal with her injuries and, at the same time, tries to keep her arch enemy, Kelly Parker, in check. With all this added pressure, she also has to deal with Marty as her new coach. This leaves her feeling alone, and the only person she can talk to is Carter. And as the girls prepare for competition, they want someone they know and trust to help coach the team, so they conspire to get Marty fired. Meanwhile, Payson's negative feelings about her back injury finally turn into something positive.