This is really interesting to me. From my own thoughts and other responses it seems that creativity is at the crux of not-stress. I'm sure that, people being people, there are some who can only create while under pressure. But for me, especially when I'm writing, I must be in an alpha-wave state.

Edit: I didn't put writing in my original post list because I'm very self-critical of my writing. I love the process but then feel, oh, no one will enjoy this.