This is awesome, but how do these people not know it's him???

Arnold Schwarzenegger decided to go to his old lifting ground, Gold's Gym, to have some fun and do some good.

He dressed in a "disguise" as a trainer and walked around giving fitness advice. Why? Well, he was having a little fun but he was also raising awareness and some money for the After-School All-Stars. It's a program that provides free mentorship, homework help, fun activities and tutoring to low- income families.

Not only is Arnold going to match every dollar donated, but donors who donate through omaze.com will be entered for a chance to go to L.A. and hang out with Schwarzenegger in his Sherman Tank!