Following his success as an undercover policeman in the film Kindergarten Cop, Arnold Schwarzenegger disguised himself as a personal trainer at a California gym.

The stunt was pulled off by the Former Mr Universe in a dashing black wig, and tasty black moustache at Gold’s Gym in Venice.

He began by wandering around the gym and butting in during people’s workouts to ask them questions about what they were doing. Their reactions were recorded, as some spoke of him looking vaguely familiar, but they could not figure out why.

The whole undercover affair was set up to support children’s fitness through the group After-School All-Stars. The YouTube video of the endeavour has already attracted more than 3.5 million hits.

Image credit: YouTube