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When the camera scans the faces of the Seahawks players before kickoff, you'll notice a focused seriousness.  The Hawks players have their game faces on.
You probably have a pretty good understanding of what that means, but in case you don't, the Urban Dictionary describes a game face as "a confident swagger you bring out when you are about to get ready to tackle something difficult, or when you are about to take on a challenge." 
But is getting a game face on a myth, or does it really improve performance?
According to a study conducted by the University of Tennessee, researchers found that people who put on their game face finished a puzzle 20 percent more accurately and demonstrated better stress recovery compared to people who didn't make the face.
That's not exactly the same as having all  6'5'', 255 pounds of Jadeveon Clowney bearing down on you but it does seem to indicate the accuracy of previous studies that showed facial expressions can positively impact mood and perhaps performance.
Takeaway -  Got a tough task to do? Want to improve your chances for success?  Get your game face on!