I have an affinity for parkour and freerunning, although (as yet), I can't do either.  It just looks really cool. It's all about expression. Both disciplines focus on traversing urban terrain and environments the fastest way possible using the least amount of energy. Freerunning adds a little more acrobatics.

Stuntman and former gymnast Damien Walters is well versed at both. He's done stunts and fight coordinating in quite a few blockbuster movies (Kick-Ass, Hellboy II: The Golden Army, Captain America: The First Avenger, 47 Ronin, etc.). Check out his awesome showreel. It left me in awe!!!