Hollywood movie star Arnold Schwarzenegger gave gym members in California a shock when he went undercover to give fitness tips for charity.
The former California governor became 'Howard Kleiner' for the prank, a fitness instructor who has become a regional manager for Gold's Gym in Venice, California.
The 66-year-old is seen adopting a disguise which includes a wig, moustache and a baseball cap before giving gym tips to astonished members.
Perhaps using tips gained from his bodybuilding past, Scwarzenegger was unforgiving with his demands, telling one member to "Stop being a baby. This is Gold's gym it's not a baby gym".
To another member struggling to complete sit-ups, he said: "You have elbows and knees. so touch them."
One client seemed to guess the identity of 'Howard' remarking, "You look familiar?", to which the 66-year-old replied, "Maybe you saw me on the FBI's most wanted list".
Despite his gruelling methods, the 'manager' was attentive to clients, finding time to wipe sweat off the brow of a hard-working man.
Schwarzenegger was raising money for After-School All-Stars, a nationwide programme that provides free mentorship, homework help, tutoring and fun activities to students from low-income families.