Beyoncé stormed through the door at the P.S. 161 middle school in Harlem, the P.S. 161 middle school in Harlem,  and surprised students by teaching them the moves from her “Move Your Body” video. As part of the “Let’s Move! Flash Workout” campaign to help curb childhood obesity, the blonde superstar appeared in the gym much to the delight of her young fans, who danced alongside her and took photos.