The Crows introduced closed main training sessions six weeks ago and will continue the trend for the rest of the 2009 season.
The Power, who have not held a closed session in recent memory, have decided to copy their cross-town counterparts and shut the gates on their own main training ahead of Showdown XXVII on Sunday.
But the closed sessions could prove to be a futile exercise for both clubs.
Adelaide and Port Adelaide both have corporate facilities at the venue, which would allow the respective coaches to watch the opposition train from the comfort of a fully-catered box.
But Craig said his club would the resist the temptation of spying on Power training.
"There's an agreement amongst the clubs [not to spy] and we don't want it to become a circus," he said on Wednesday.
"I don't know what Mark's going to do at training, but I've already explained the reasons we do it [have closed sessions]. It could be just one simple exercise, say the stoppage work, but the rest of our training is pretty much as it's been for the past couple of years.
"The game won't be won on the training track."
Williams denied his club's decision to hold a rare closed session in Showdown week was an act of gamesmanship.
He said the Power would be trying some different things at training on Wednesday, and joked that spying on the Crows might not be out of the question.
"We've got some very secret things to do this week ... since Adelaide has done it they've won almost every game, so we might have closed sessions for the rest of the year too," Williams said.
"Apparently we've got match committee at Suite One [at AAMI Stadium] tomorrow, so if the Crows are training there ... no, I'm not sure [what we'll do].
"No, we're not interested in training. We know what the Crows are going to do. They're very disciplined and we're going to have to play disciplined footy against them."
