The Gait Guys are always putting out solid material for manual therapists. I'm always interested in reflex's and this article is pretty interesting. We know eyes drive extension when you look up and drive flexion when you look down. I'd never been aware of how neck motions can also drive this.
More on Stretching.
Joel Jamieson owner of 8weeksout.com gives a great introduction video for Breaking Muscle. Solid information. Always good to review the basics.
Energy Systems 101.