David Goffin is a quick learner. Marin Cilic? Well…

At the Madrid Open, those two—along with John Isner and Guillermo Garcia-Lopez got some instruction on the dance craze that’s sweeping the globe: flossing.

The ball kids and other youngsters on the scene were patient with their older students. All of the players had the arm extensions down, but things got a little tricky when it came to coordinating with the hip movements.

It doesn’t look like Cilic ever got there.

Goffin, though, picked it up rather easily, it seems. Who knows? Maybe pop star Katy Perry could give him a shot, like she did with the teenager associated with the flossing dance, the Backpack Kid:

One of these players will have to break out the move when they win their next tournament.

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