Recommended additional research: “Animator Friendly Rigging” by Jason Schleifer. Jason is a world renown artist, animator and creature technical director and has rigged and animated creatures for the likes of Weta Digital, PDI Dreamworks, Animation Mentor and many others. He has a collection of video tutorials for sale on his website (jasonschleifer.com/afr/) and if you’re serious about being an animator or a character TD, you should purchase them. The tutorial I’ve created here is my own take on some of Jason’s teachings with my own custom modifications and approach. There is no single correct way to rig a spine, but this one works really well in most situations and it’s fast, easy and fun to animate with.