This is skill is one that may people dont know how to do. yet it is very easy to get to. first off go to skilling through the red portal at home. now you have to run to falador to get to to a man named "Pirate Jackie the Fruit. he looks like.
Now talk to him. He will take you here.
Walk across the log and you will recieve 40k xp. keep walking across the log untill 99. It will take about 325 runs across the log. i knwo its boring but it is rewarding.
This is a map of the path you should take to get to falador.