BEST OF TRICKING 2015
A practitioner of parkour is often called a traceur, with the feminine form being traceuse. They are nouns derived from the French verb tracer, which normally means to trace, as in tracing a path, in reference to drawing. The verb tracer used familiarly means: to buck up. The term traceur was originally the name of a parkour group headed by David Belle which included Sébastien Foucan and Stéphane Vigroux.
A jam refers to a meeting of traceurs, involving training lasting anywhere from hours to several days, often with people from different cities. The first parkour jam was organized in July 2002 by Romain Drouet, with a dozen people including Sébastien Foucan and Stéphane Vigroux. (source : wikipedia