OK, I searched the whole forum but couldn't find this way, if this is a repost just delete it...
Requirements: Ordinary Mount
So first climb up here:
http://img51.imageshack.us/img51/2671/24342922.jpg
Now climb here and run till you can't anymore:
http://img820.imageshack.us/img820/2457/85058597.jpg
Mount up, jump just once (short jump), you should get something like this (If you don't, try a few more times):
http://img709.imageshack.us/img709/5584/32231266.jpg
Now move your camera to the right till you get something like this:
http://img571.imageshack.us/img571/2138/49091703.jpg
Dismount and do a half jump (jump and then right after click Forward), it should look like this:
http://img717.imageshack.us/img717/8603/47088038.jpg
Now turn your character to the left (you shouldn't move it more than those two black lines):
http://img94.imageshack.us/img94/8299/17816125.jpg
Here comes the easy part, now just run straight, remember, don't jump just run!
Succes
http://img819.imageshack.us/img819/5769/55006302.jpg