You’d have to have a heart of stone not to be moved by this in some way. So, it seemed like a regular day for the kids at PS 161 in Harlem. Here they were dancing to a Beyoncé song in the gymnasium, probably concentrating hard on getting their moves right and staying in sync with the other dancers. Then, just before the halfway point in this clip, Beyoncé herself shows up, fits into the routine, and shows these young whippersnappers how it’s really done. Impressively, the kids are mostly unfazed aside from a few shrieks, and manage to keep the whole routine going until the end. This appearance was part of the Let’s Move! initiative, which Michelle Obama founded to help tackle childhood obesity. Check out their work here.