Doodle into relaxation

Coloring books, though, are by far the most popular kids’ activity for grown-ups. And it’s not hard to see why.

Just imagine your favorite coloring book as a kid, only updated to reflect your much-improved motor skills and worldliness. Wouldn’t it be nice to take an hour with a cup of coffee and get lost in a sea of possibility and imagination?

These books are selling at breakneck pace. Publishers are even having trouble keeping them in stock.

The book that started the craze, “Secret Garden: An Inky Treasure Hunt and Coloring Book,” has sold over 2 million copies worldwide since its release in 2013.

It doesn’t look like this coloring book train is slowing down any time soon, so here are three reasons you need to get on board.

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1. A good coloring session can relieve stress and anxiety.

2. No paper? No problem. Now, you can color on the go.

3) These coloring books are also hilarious.

Whether you’re coloring to relax or just to have some fun, there’s a coloring book out there for you.