Shove your upper body inside an inflatable plastic ball, toss a soccer ball on the ground and get ready for some physical contact. That's knockerball in a nutshell, and it's exploded in popularity during the past year. But video of Cam Newton playing the game -- and using the inflatable padding to launch himself into an opponent -- raises a worthy question: Is this really smart behavior on the part of Carolina's franchise quarterback? The Rundown debates.

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