Well what help do you need.
First choose a mod.
Then start witha jump or walk. Do everything you need to get the other side . Use your chest and pecs , they help alot.Use your arms and hands.
It's REALLY HARD to do a parkour that looks good, all parkours are completeable at a low level of skill, but they will look "rough" in that you won't be moving realistically.
For realistic parkours you will have to play toribash alot for a long time to do. (maybe 2 or 3 months) Which is if you play Non-Stop toribash.
Running is a good start but you need to think a few TFs ahead for jumps.
To do a parkour, yes first you need for running and jumping, and I wanna add something, you should have to control your tori like your brain controls your body, and make your move flows don't just play with a classic running