To me it’s no less or more of a sport than gymnastics, and someone who’s built like a gymnast would have higher performance in both sports than some of the twigs who participate. Movements that are difficult like a world record snatch or a double back layout are all impressive to me.
An old favorite thread of mine:
http://www.T-Nation.com/free_online_forum/music_movies_girls_life/video_jawdropping_athleticism
It has an assortment tricking, parkour and other vids from a few years back.