I am a fan of American Football and the Patriots are a great team but I believe that being a fast runner is not enough if it was you would be a wide receiver. Great running backs have the ability to make 'the right decisions', have strength, power, speed, intelligence and the ability to hold onto the ball when they are being tackled.I believe Adrian Peterson of the Minesotta Vikings has all the attributes to become a great running back from what I have seen of the NFL running backs this season. The New York Giants have a running back called Jacobs and although he is not as fast as Peterson, he is very big with speed which makes it difficult for defenders to stop him.