To me, parkour is focus, overcoming fears, overcoming any obstacle, mental or physical.
It's about being strong (but not just physically so), useful and adaptive.
It's about supporting others, building them up. The sense of community I get when I practice with others. But it's also about pushing myself to my limits--and overcoming them, time and again.
Whenever I'm up against a wall, mental, physical, or otherwise, my parkour is there for me, and whenever I'm training with someone else, I'm there for them, a hundred percent.
There's so much more to it than pretty tricks and showing off.