Arnold Schwarzenegger has gone undercover to prank people at Gold’s Gym in this viral video.
The former bodybuilder pretended to be a trainer named Howard who had a mustache and ponytail.
Some of the people he pranked said he looked familiar. He explained the importance of drinking water to one woman and gave tips to others.
The prank was part of a campaign to raise money for a health and fitness after-school program.
Arnold Schwarzenegger uploaded to his YouTube channel earlier this week and it already has more than five million views.