If you've ever wondered about the basics of how to play (or at least follow) American-style football, you're not alone. American football can seem like a bunch of guys repeatedly crashing into each other until you understand some of the basics and start to see the strategy involved.
![Why do quarterbacks shout [COLOR] + [NUMBER]? screenshot 2](https://i.ytimg.com/vi/PH0McYsAlzQ/mqdefault.jpg)
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