Australia and the World Past and Present

AFL Spectators like a fast, free-flowing game.

It used to be that the players who started the game would play the entire the game – unless they were injured or significantly fatigued.

Then an idea arose in AFL administration, that if you had more rotations, players on the field would remain fresh. The theory was that this would quicken the speed of play, that fresh legs would lead to a more exciting game.

The irony is that as the number of interchanges increased, so did congestion and scoring dropped.

The traditional view is that fatigue creates open and exciting football.

In the 1970s and 1980s, midfielders played most of the game. Ruckmen rarely left the ground. Players became exhausted in the second half.

As fatigue set in, defenders were slower to close space. Midfielders found it harder to maintain defensive pressure. Teams found it harder to flood numbers around the ball and attacking players could exploit open space.

This often produced the free-flowing football that many older supporters remember.

When the AFL allowed a greater number of interchange players, clubs discovered they could use the bench tactically rather than merely for injuries.

By the late 2000s, elite midfielders were playing perhaps only 75–80% of the game. Players could sprint harder because they knew a rest was coming. Fresh players shut down open space.

Coaches such as Ross Lyon became masters of defensive structures.

His teams at St Kilda and Fremantle showed that with enough fit players you could press aggressively and fill defensive zones. You could restrict opposition ball movement and maintain pressure for four quarters. Fresh legs made these systems sustainable.

During the peak interchange era (roughly 2007–2014) rotations often exceeded 120 per game. Players ran further than ever and defensive pressure reached unprecedented levels. Yet scoring generally fell compared with previous decades.

Many analysts concluded that fitter players did not necessarily produce more free-flowing football.

Instead it produced more contested possessions and more stoppages.

Beginning in the 2010s, the AFL decided that it needed to introduce interchange caps.

The reasoning was simple. If players become more tired, defensive systems break down, space would open up and more goals would be scored.

There were further interventions like the introduction of the 6-6-6 starting position.

Many of these were attempts to artificially create the space that fatigue once created naturally.

Many football people believe that expanding interchange unintentionally reduced the amount of open space on the field. The AFL’s subsequent efforts to cap rotations were largely an attempt to reintroduce the effects of fatigue that older generations of football naturally produced.