"B-boying or Breaking, also called Breakdancing, is a style of street dance that originated among African-American and Puerto Rican youths in New York City during the early 1970s. The dance spread worldwide due to popularity in the media, especially in regions such as South Korea, United Kingdom, Germany, France, Russia, and Japan. While diverse in the amount of variation available in the dance, b-boying consists of four kinds of movement: toprock, downrock, power moves, and freezes. B-boying is typically danced to hip-hop and especially breakbeats, although modern trends allow for much wider varieties of music along certain ranges of tempo and beat patterns.
A practitioner of this dance is called a b-boy, b-girl, or breaker. Although the term "breakdance" is frequently used to refer to the dance, "b-boying" and "breaking" are the original terms. These terms are preferred by the majority of the pioneers and most notable practitioners." - http://en.wikipedia.org/wiki/B-boying

"Jam skating (or Jamskating) is a combination of dance, gymnastics, and skating, performed on roller skates. The style of skating has its roots in traditional roller disco, but has been influenced by breakdancing, artistic skating, gymnastics, and modern dance. Successful jamskaters are well practiced in these different forms and must have the ability to translate these movements while on skates.
Jamskating is neither aggressive nor sphttp://en.wikipedia.org/wiki/Jam_skatingeed skating. This form of freestyle skating is referred to by many different names: toe-dancing, spot-skating, shuffle skating, hexing, rexxing, trucking, shadow skating, crazy leg, boogie bouncing, and disco skating. These names strictly describe the style of skating, not the moves." - http://en.wikipedia.org/wiki/Jam_skating