The Gunners cannot afford defeat in their Champions League clash.
"We look at it," Wenger said. "The distances we run are important but it is not how much you run, it is where you run and how intelligently you run.
"Usually the teams who have the ball less run more.
"It [running] is important in the modern game, especially when you play against Dortmund, a team of high potential. It is important that your team raises their level to their maximum."
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