Don't think theres any manga about parkour yet. Think the whole parkour thing is still too new for Japan to write a manga about.
Closest thing I can think of is Air Gear at the beginning, going from point A to B on rollerskates, jumping off rooftops 'n stuff. But it's....... well....... kinda........ yeah.
________________ Do but despise reason and science, The highest of all human gifts - Then you have surrendered to the Devil And must surely perish. - J.W. von Goethe
None that I can think of focus solely on Parkour, but Shizuo and Izaya in Durarara!! are excellent at it, having learned it from necessity. It's only a very, very vague association, but it's all I can think of at the moment. Sorry. ;A;
cant think of a parkour manga but there is one issue where a woman is doing a parkour run (for whole issue) to stop a bomb explosion in global frequnecy by warren ellis if you dont mind scifi/technothriller western comic