So what you do, you gotta repeat this the entire time you're playing


Step 1: Breathe in

Step 2: Breathe out

Tell this to your friends, teammates, even the enemies if you wish.

Step 1: Breathe in

Step 2: Breathe out

The zombies don't need to breathe so you just gotta remember the two step program for yourself and/or your friends

Step 1: Breathe in

Step 2: Breathe out

Congratulations soldier, you have now completed breathing boot camp and are now prepared to breathe during the campaign, multiplayer and zombies experience!

Go have fun with the multiple endings of the Campaign

The very difficult and complicated easter eggs of the Zombies mode

and calling each other all sorts of slurs while in a Multiplayer lobby