Participants warm up in a circle as a group before a Parkour training class in Brookline, Mass., Wednesday, Jan. 29, 2014. Parkour, developed in France in the 1980s, borrows elements from martial ... more 
Participants warm up in a circle as a group before a Parkour training class in Brookline, Mass., Wednesday, Jan. 29, 2014. Parkour, developed in France in the 1980s, borrows elements from martial arts, gymnastics, rock climbing and other athletic fields to enable participants to turn obstacles like park benches, trees, guardrails, and buildings into tools they can use to nimbly propel themselves forward. (AP Photo/Charles Krupa) less 
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Associated Press | Photo By Charles Krupa
Fri, Feb 28, 2014 8:51 AM EST