Bar wire is the English word "bounce", which means: bounce, rebound; Jump, jump; Shake up and down; Tip; Go skipping rope.
Bounce, one of the four elements in hiphop, is also called "updown", but its meaning is the same. This is a basic feeling, that is, the feeling of elasticity.
In early America, the original concepts were only bouncing and going up and down, which was invented by the Japanese. At present, many dances in Europe and America still only feel bouncing, and many updown sayings in China are influenced by Japan.