They do this because they get excited about the game. What you describe is merely celebration for scoring a touchdown or something. If you’re wondering why the celebration is so extreme, I think it’s just because people have so much interest in watching or playing the sport; this makes the outcome that much more exciting. As for the IQ level thing: Sports are often more physical than mental. You might see this kind of behavior at a football game, but not, for example, a chess match.
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Name : Patrick30441, Gender : M, Age : 21, City : Menlo Park, State : CA, Country : United States,