Train Hard - Stay Humble
After three years training I still don't have these down, and I believe it's -mainly- because I'm not training them (duh!). The other reason is that I don't see them done a lot in our community.
People have first class cat leaps or wall runs, but when it comes to climb up from a stationery cat leap position it gets pretty sloppy and slow (<- not parkour... lol!).
So besides the good suggestions on this PKCali thread, I recommend starting to work on this; I for one, would like to have somebody that either is willing to teach them to me (live), or just taking up the personal challenge and try to get them together.
Also, I think I don't have any genetic or mental obstacle to learning them, that's why I'm not showing you another superstar traceur (<-oxymoron), increasing the idolization going on in Parkour ("OMG! Danny! Oleg!") in the process, but our fellow PKCali member David Jones, about a year in his training.
It seems to me that he has it down: