Can zombies run or do they only walk? The purist position appears to be they shamble; they think it’s ridiculous that dead people can run. To which I say: Um, this is a debate about what dead people can do. Dead people can’t walk or run or crave human flesh.
So I say: If people like running zombies, they should have them.
Me, I like ’em slow, fast, dead, alive, whatever, as long as it’s a good story.