premise: American football strategy concerns the deployment of offensive, defensive, and special teams players and the execution of plays in American football. In American football, there are a vast array of positions, formations, strategies, plays and types of play calling systems that are utilized. If a strategy is for a particular game, it is known as a "game plan".
hypothesis: There is one specific game plan which is universally successful.
reason: The text summarizes what a game plan is without specifically naming any and also states there is a huge variety of systems used.