THE mega-budget Brad Pitt film World War Z appears to be about lots of people going for a run together.

The trailer for the summer blockbuster, which had been rumoured to involve zombies, shows hordes of people running for no apparent reason.

A studio source said: “It’s a nightmarish vision of a world where everyone is constantly running.

“It confronts issues like how the human race would stay hydrated in this situation, and whether our species could cope with really bad blisters.”