Michelle Obama, Jimmy Fallon share a second 'Evolution of Mom Dancing'

The 'One Move Behind in Zumba Class' is just one new step from @FLOTUS and Fallon's Evolution of Mom Dancing 2

Jimmy Fallon and Michelle Obama have reunited for "The Evolution of Mom Dancing Part 2."

And here's a taste: "Oh My God, I Didn't Know You Were Coming Here!"

The first lady, who debuted the sketch with Fallon two years ago when he was the host of "Late Night," appeared on his "Tonight Show" on Thursday for a hefty helping of the "Shimmy Twist" and the "Knock Knock" in honor of FLOTUS' Let's Move health initiative and the Gimme Five Challenge.

Fallon kicked off the routine decked out in his same old campy mom uniform: a pink cardigan, khaki capris, white sneakers and a brown wig. Obama, 51, joined him in a similar pink cardigan but worked a slightly more updated look befitting the president's wife.

While the fun-and-frumpy moves started off basic enough, they evolved, and the duo introduced the lesser-known "Getting a Bag From Your Collection of Plastic Bags Under the Sink," the "I Can Still Do This Dance Because My Arms Are in Shape" and my favorite, the "One Move Behind in Zumba Class."

Watch the video above to see the amusing finale and learn which surprising strut got the biggest laugh.

Then click on the second video to see the 2013 version. Weigh in on your faves in the comments.

Follow me on Twitter @NardineSaad

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