Parkour

Sometimes people ask, "who is the best at parkour" and its because they don't understand what parkour is, 'who is the best' is what you would say to a sport, parkour is not a sport its an art form.  

Your background, influences and your style show in the way you move.  Whether your a gymnast, breakdancer or martial artist.

Your style is a cause and effect reaction of your life, so in that sense by saying who is the best athlete is like saying who has had the best life, and you can't really say that.