I start my day writing by rereading the last twenty pages. This helps me get back into the voice and tone and forward movement of the story. I write a thousand words a day no matter what. I never have writer's block per se. I do however get stuck usually in what I call the belly of the book (the four c's, conflict, complication, crisis, conclusion. The belly is the complication). Usually it is a transition or a motivation I'm stuck on. As far as your standard everyday writer's block if there is ever a question, an option in which way to proceed, I always, always choose the path with the most conflict.