Zombies may have the trademark zombie limp because their bodies are affected by the same decomposition process as any normal corpse. Additionally, rigor mortis would cause serious tissue and muscle damage at the zombie’s each step. Since zombies do not regenerate or heal, any damage is permanent. Eventually, a zombies’ top speed would be reduced to a crawl and perhaps even slow to the point where it could not move.
There is a law in Haiti that makes it a crime to turn someone into a zombie. Article 249 states that if someone drugs another person, buries him as though he were dead, and then digs the person up and brings him back to life, it is still considered murder.