Everyone knows that physical exercise is important in keeping your body in shape, but what many people don’t realize is that it’s crucial to do exercises that will keep your brain in shape as well. Now, a brain teaser is going viral that only one in seven people are able to figure out.

How many holes does the T-shirt below have? The answer is somewhere between 2, 4, 6 or 8.

Try and figure out the puzzle for yourself! It may take you a few minutes. If you want to find out the answer, scroll down.

Okay, here is the answer.

The answer is 8! Here’s an explanation as to why 8 is the answer.

As you can see, there are two holes in the front of the t-shirt, two holes for the arms, one for the head, and the hole at the bottom. That is six of the holes, but you just see the shirt just from the front side. Look, there are two more holes in the shirt!

Remember that the shirt has a back side as well, and one would expect that there are equal holes on the back side of the shirt. If you add this to the six other holes, you will see that there are eight holes in total.

Brain teasers like this are great in that they keep your mind in shape. What are some of your favorite brain teasers? Let us know in the comments section!