Problems are relative, any way you slice them. However having zombies chasing you, yes, that is a big problem.
However if you are in good physical running condition, there is a much better chance you will escape said zombies. Also as the sign says, running will help you loose weight. Yes, running sucks, to a certain point, but escaping Zombies is generally considered a good thing, never mind that zombies only exist in movies and on television. Oh, like, you thought they were a real thing? Alright, I’ll phrase that differently, being capable of running could help you to elude bath salt users.