Shailene Woodley has just one thing to say about her Insurgent co-stars.

"First off, they're just really groovy ladies!" the actress gushed of her Insurgent castmates Octavia Spencer and Naomi Watts when the three sat down with ET’s Brooke Anderson to talk social media and staying in shape for the highly-anticipated Divergent sequel.

VIDEO: New ‘Insurgent’ Trailer Shows Tris Battling Against Herself

And the affection goes both ways.

"She is mind-blowingly talented," Watts said of Woodley. "She's got that vulnerability but that ferocity as well."

In the action-packed adaptation, Woodley plays Tris, a member of the Divergent faction, on the run from the oppressive Erudite government. The high-octane storyline necessitated fitness and totally commitment from the film’s leading lady.

"I wanted to do as many [stunts] as I possibly could, before insurance stepped in," the actress told Anderson. "The great thing about stunts is that you get to basically skydive without the fear of your parachute not opening."

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The young cast members of Insurgent, Woodley, Theo James, Ansel Elgort, and Miles Teller, started the franchise as relative unknowns, but that’s all changed as they’ve become big stars thanks to the Divergent series and other major movies like Whiplash and The Fault in Our Stars. But don’t expect to find Woodley on social media anytime soon.

"I feel like I don't have enough time," Woodley laughs. "It takes up so much time! And your poor thumb...like the dexterity of your finger, to constantly be scrolling on your phone...I only know how to do me."

WATCH: The 4 Biggest Revelations From the ‘Insurgent’ Behind-the-Scenes Teaser

Check out a behind-the-scenes clip from Insurgent in the video below.