It doesn't matter how many times I rappel off a rock face, cliff, the side of a mountain, or into a canyon......my heart beats a little faster, and I have to slow my thoughts down and run through my safety check. The methodical process of checking my anchors, making sure my rope is properly inserted into my rappel device, that my safety Prussic is clean and neat, that my extension is just the right distance, and that I can safely weight the rope with my anchor still attached are the only things that slow my heart down enough to allow me to mentally step over the edge. If I can step over the edge mentally, I can step over it physically, and then it's a whole new kind of beating heart; the "oh my god this awesome" kind of rapid heartbeat. The kind of moment where the breath catches in your throat and the amazing feeling of being suspended in air hundreds of feet above the earth doesn't terrify, it exhilarates. You know you have things in control, and your confidence allows you to experience a moment that others would run away from, screaming in terror.....but not you.
I firmly believe that we should strive to do something every day that scares the hell out of us. It's imperative that we step out of our comfort zone regularly, by whatever means necessary, in order to experience life fully and prevent ourselves from becoming stuck in the mud of a ho-hum existence. Life is an adventure, so why not live it like one?