Speaking to Entertainment Weekly, Gale Ann Hurd explained that the team behind the series wanted the creatures to match director Frank Darabont's ideas.
"We actually had 'zombie school'," she said. "We wanted to make sure our zombies were consistent with Frank's vision. So we showed them a compilation of video clips of movements that would be appropriate in our world, as well as a list of rules about our zombies.
"In other words, they are not Usain Bolt super-sprinters. You're no longer alive, so to speak, so your organs and your limbs aren't going to be working quite as well as they did when you were alive."
Hurd also praised the way the show takes different approaches to zombies.
"Let's face it, the zombies' modus operandi is to kill and consume people, so we do have to have some of that," she said. "And the humans are in a position where they need to dispatch zombies, and that can be with shovels, guns, axes. You name it.
"It's really pretty interesting, because every show has kind of a different take. The second one has a lot of action, but the third one actually has a lot of character development and we spend a lot less time with zombie attacks."
The Walking Dead premieres on Sunday at 10/9c on AMC in the US and on November 5 at 10pm on FX in the UK.