GALLERY: Celebrities go planking

UPDATED 7/12

Planking: It’s taking over the world!

If you’re a little confused on what it is, allow Urban Dictionary to define it:

The art of planking is to lay horizontally across any object or the ground with their arms by their sides, aiming to occur in daring situations or a brotherly display of core-strength..

Yeah… it’s really pretty simple and dumb, but EVERYONE is doing it… and that makes it cool, right?

Even some of the biggest celebs are doing it. Look!

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Who do you think has the best one? Do you plank? We want to see your pictures!

And now that Richard Simmons is joining the craze… is it still cool?