Explanation is here.
Parkour (sometimes abbreviated to PK), l’art du dÃ©placement or free running  (English: the art of displacement) is an activity with the aim of moving from one point to another as efficiently and quickly as possible, using principally the abilities of the human body. It is meant to help one overcome obstacles, which can be anything in the surrounding environment â€” from branches and rocks to rails and concrete walls â€” and can be practiced in both rural and urban areas. Parkour practitioners are referred to as traceurs, or traceuses for females.
Founded by David Belle in France, parkour focuses on practicing efficient movements to develop your body and mind to be able to overcome obstacles in an emergency. Also may be a form of entertainment or as a pastime.
YouTube has some examples of Parkour:
A great article (longish) from Rolling Stone:
All told, the United States has spent an estimated $500 billion to fight drugs – with very little to show for it. Cocaine is now as cheap as it was when Escobar died and more heavily used. Methamphetamine, barely a presence in 1993, is now used by 1.5 million Americans and may be more addictive than crack. We have nearly 500,000 people behind bars for drug crimes – a twelvefold increase since 1980 – with no discernible effect on the drug traffic. Virtually the only success the government can claim is the decline in the number of Americans who smoke marijuana – and even on that count, it is not clear that federal prevention programs are responsible. In the course of fighting this war, we have allowed our military to become pawns in a civil war in Colombia and our drug agents to be used by the cartels for their own ends. Those we are paying to wage the drug war have been accused of Âhuman-rights abuses in Peru, Bolivia and Colombia. In Mexico, we are now Ârepeating many of the same mistakes we have made in the Andes.
Pat Condell’s latest.
(via Atheist Media Blog)