Mechanical dance (English: popping, referred to as poppin') is a style of funk dance and street dance, which basically makes the dancer's body feel trembling through the skills of rapid muscle contraction and relaxation. This skill is called "popularity" or "hit". Dancers will use many different movements and postures to match the rhythm of the song. Mechanical dancers are also called "poppers". 20/kloc-in June, 2003, Kenichi Ebina, a player from Tokyo, Japan, performed a hacker-style machine dance in Shock.