I looked up "Parkour" on word list.com and got grades for parker, parky, perkier, and porker, but not for parkour! Spell order of payment suggests parcel our, parker, and parlor, but doesn't have parkour. I even looked it up in Merriam Webster's Collegiate Dictionary, the 11th and most recent edition, but it wasn't there, any. It does live though, and its quality is mushrooming.
So what is it? It's a develop of athletics that involves body crusade and avoiding obstacles in one's course by jumping, vaulting, or rising complete them. Its core is French, but in new years, has get popular in the United States. The laminitis of Parkour, David Belle, describes it as "using personal nimbleness and rushed rational to get out of awkward situations, and to be competent to go anywhere that one desires."