Because we regard fear as something that we have to deal with, we do not just let it be and it becomes empowered to stop us. The appropriate way to deal with fear is to be with it, to choose to experience it, and to be afraid. You let fear be and it lets you be. In the context of skydiving, you are afraid and you jump. Fear goeswith skydiving.
http://www.laurenceplatt.com/breakthrough/obs8.html