What is "oberek"

The oberek, also called obertas or ober, is a lively Polish dance. The name "Oberek" is derived from "obracać się" which in Polish means "to spin". It consists of many dance lifts and jumps. It is performed at a much quicker pace than the Polish waltz and is one of the national dances of Poland. This is the second-most popular dance in Polish-American music, after the polka.