What is the dance movement when some one stands in the front and someone stands behind them then the person behind them moves to the side then front next to them while dancing usually happens in group dances

Modern dance is an American contribution to choreography, much as jazz is a product of American culture. Pioneers in modern dance were and are bold, experimental, initially shocking and obsessively concerned with exploring the language of the body and all its possibilities. Martha Graham, Ruth St, Denis, Isadora Duncan, Merce Cunningham, Paul Taylor, Alvin Ailey and more incorporated ballet, jazz, ethnic dance and a unique series of moves that are more than steps—but as clearly defined and as challenging to master.