Fremantle coach Mark Harvey is threatening to unleash the water bombs as he tries to match West Coast's unusual lead-in to Sunday's AFL western derby.

The Eagles brought smiles to the faces of onlookers at training on Wednesday with one of the more bizarre drills ever seen at the elite level.

Under the orders of coach John Worsfold, West Coast players were told to spin around in circles until they were dizzy before attempting to pick up a ball off the ground.

The exercise produced some comical results and led Fremantle coach Mark Harvey to quip: "I was actually dizzy watching them.

"I'll make sure that our blokes will do something different at training tonight.

"We might just get water balloons and throw them at each other and work it from there."

Harvey revealed gun Dockers midfielder Stephen Hill was also employing a strange pre-match routine to help him deal with what is expected to be a tight tag from one of the Selwood brothers.

"He's got Scott Selwood's photo next to his bed and he's been looking at it all week," Harvey said with a smile.

It isn't the first time Worsfold has unveiled an outside-the-box training exercise.

In 2005, midfielder Chad Fletcher ran into a fence at training after Worsfold incorporated blindfolds into a drill.

Worsfold said there was method to the madness of his latest initiative.

"In the past there's no doubt the monotony of every session - players can get a little bit robotic, they can just turn up knowing this is what we're doing, this is the program," Worsfold said.

"It doesn't hurt to change it up every now and again.

"It was just a very light session (to) get some blood flowing.

"We would normally do a normal training drill for seven or eight minutes but I decided to change it up a bit, have a bit of a laugh."

Harvey is yet to lose a western derby as coach, winning all seven encounters since taking the reins late in 2007.

The 45-year-old played in numerous blockbuster matches during his 206-game career with Essendon, but said the rivalry between Melbourne-based clubs was completely different to a western derby.

"It was more of a 10-team town (in Melbourne), this is a two-team town," he said.

"This divides many things, from work colleagues to businesses to which side of the river you live on.

"I enjoy the banter that goes with it."

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