Hello: The rub step you mentioned is actually called cha-cha step in square dance. You can search the Internet for videos of cha-cha-cha step, and you can follow the video to learn it. There are many such videos. For example, /v47/dANYNEOjwD2zwA2.html this video is there, is sugar beans classroom XuanXuan teacher taught.
If it helps you, please adopt it!