Here is a tutorial , alot of it is practice aswell .
http://forums.toribash.com/showthread.php?t=80728
Alittle tip when you tori is starting to do longer strides - usualy when your about to take that third step , the leg extends alittle far so before your knee gets to high , relax your hip thats going to take the next step for 10 frames and that will slow the leg raise for a better foot placment .
I suggest practicing long dictance running on the ground to learn balance and remeber to rotate your pecs with each stride when your tori starts to pick up speed .
Another tip is to keep your feet flat on the ground when running , so use your ankles to do that . It will help you go in a straight line .
OH ! and some parkour mods need a 10 frame turn at the start when your body is holding , The player is alittle to high up to get the proper grip on the object or ground .