What gets you in the mood to write? For me personally, it's music. I've always been a fan of movie soundtracks. Maybe that's because the key points in movies are always accompanied by music to enhance the impression made on the audience. "What a Feeling" from Flashdance, "Take My Breath Away" from Top Gun, "Must Have Been Love" from Pretty Woman, "I Will Always Love You" from the Body Guard, "Eye of the Tiger" from Rocky, and so on.
When I'm prepping to write a particular scene, I listen to music beforehand. If I'm writing a fight scene, I'll select something with a fast pace, and it will probably be hard rock or some hateful rap (edited, though). Something that makes me want to scrap. If I'm writing a first-kiss scene, I usually go for 80's love songs, because they tend to be sweeter, and they build to a climax, like a first-kiss. And if my character is overwhelmed by loss, well, then, there are plenty of depressing songs out there for that.
But what gets you in the mood? Meditation? Reading other works in your genre? Exercise?