"I'm going to tell you how it works." Tap to watch if you're viewing in the news app. This little girl has the makings of a great hula hoop teacher. Sierra begins the lesson by passing out hula hoops ...

"I'm going to tell you how it works." This little girl has the makings of a great hula hoop teacher. Sierra begins the lesson by passing out hula hoops -- one for her and one for her "student" -- and ...