The Beautiful Game

Ajax Amsterdam invented the term Total Football in the early 20th century to describe their team concept.

Here's the wiki summary:

In football (soccer), Total Football is a system where a player who moves out of his position is replaced by another from his team, thus retaining their intended organizational structure. In this fluid system no footballer is fixed in his or her intended outfield role; anyone can be successively an attacker, a midfielder and a defender.

Total Football depends largely on the adaptability of each footballer within the team to succeed. It consists of footballers being extremely tactically aware, allowing them to change positions at high speed—in its simplest terms, every player is comfortable in any other position. It also puts high technical and physical demands on the players.

Make sense?

Now get out there on the field and do it.