After jumping out of airplanes for a few years I discovered an adrenaline rush can also be found being an actor ... with less chance of being KILLED.
But, the ACTING challenge (at least for me) is getting out of my own way ... giving up control to the CHARACTER so he can jump inside and become alive. Sometimes it's very uncomfortable when he wants to do things I wouldn't do ... or uses secret fears & emotions deep inside my personal space.
It's fun, though, when he CUSSES a lot. I don't know why, but for some reason it feels good to say "#>%!" and "≠?¤#$" in front of a lot of people and not get in trouble for it.