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Glee, Dianna Agron

Adam Rose/FOX

On Glee, you have to be a triple threat. Singing. Dancing. Acting. So when Dianna Agron stopped by The Glee Project to mentor the remaining contestants on "actability," the pressure was certainly on to nail this challenge.  So why is Agron the specialist on actability?

"I think Dianna has had more to do and more changes as an actress than any of the other characters on Glee," Robert Ulrich explains to the group. Quinn is what we would describe, in the nicest way possible, as a rollercoaster character. One minute she's the kind friend to Rachel…and the next minute she's scheming to steal her baby back from her adoptive birth mom.

"I think one of the most common things for people to do is just [think], 'I'm so focused on my lines, I'm so focused on my words. These people can't affect me,'" Agron says. "But they need to affect you. You need to kind of roll with the punches."

Get a preview of one of this week's challenges on The Glee Project and Agron's mentoring style in the clip below!

The Glee Project airs Tuesday nights on Oxygen.