Massaging Kale

I noticed in a couple recipes that people mentioned "massaging" the kale and I had no idea what that meant.

But here's the explanation given by a reviewer of the Kale Waldorf Salad recipe on how to massage kale:

"The only suggestion I have for this recipe is to massage the kale....roll up a stack of kale and chiffonade it. Then massage the kale for a few minutes. The longer you massage, the better it is. Since this makes such a huge difference, I make up a huge batch and keep in fridge for a few days....that way I always have prepared kale for different recipes."

Note: Chiffonade is a cooking technique in which herbs or leafy green vegetables (such as spinach and basil) are cut into long, thin strips. This is generally accomplished by stacking leaves, rolling them tightly, then cutting across the rolled leaves with a sharp knife, producing fine ribbons.

And how exactly do you "massage" your kale? This post from Mixed Greens explains it nicely (and I must say their Massaged Kale Salad recipe looks mighty yummy too!)