Stepping or step dancing is “a percussive dance in which the participant’s body is used to produce complex rhythms and sounds through a mixture of footsteps, spoken word, and hand-claps,” writes the African American Registry.
Step has its origins in Africa, as dancing has been a large part of traditional African culture for centuries.
Calling Step a "bizarre silent dance without music" has to be one of the wilder antiblack racist descriptions I've ever heard of stepping lmao. Anyway if you see the video, it's step!!! They're stepping!! It's a Black American form of dance!!