People tend to assume that you have to be a big, dumb meathead to be good at things like rugby and American football. The aptitude test given by the NFL is called the Wonderlic Test, but it is used in other fields. The average test results by profession are as follows:

  Systems Analyst – 32
  Chemist – 31
  Electrical Engineer – 30
  Engineer – 29
  Programmer – 29
  Accountant – 28
  Executive – 28
  Reporter – 28
  Teacher – 28
  Copywriter – 27
  Investment Analyst – 27
  Librarian – 27
  Electronics technician – 26
  Salesperson – 25
  Secretary – 24
  Dispatcher – 23
  Drafter – 23
  Electrician – 23
  Nurse – 23
  Bank teller – 22
  Cashier – 21

The average score per NFL position is as follows:

  Offensive tackle – 26
  Center – 25
  Quarterback – 24 (Most teams want at least 21 for a quarterback.)
  Guard – 23
  Tight end – 22
  Safety – 19
  Linebacker – 19
  Cornerback – 18
  Wide receiver – 17
  Fullback – 17
  Halfback – 16

So the big, beefy guys taking all the hits right in front of the quarterback, on average, score better then the quarterbacks, and on average, score better then electricians, draftsmen, salespeople, and nurses.