Hey,

As we all know there are couple of techniques for building advance twisting torso . One is by Jason Schleifer which became a very standard and well known technique in the industry and second is Arron Holly's Ribbon Spline.

As we know there is always an issue when we rotates spine about 180 degree, which can be avoided by using, yes you are right  thats "Ribbon". Very handy and great technique.

  Recently I saw a tutorial written by Mat Berglund about creating no flip spine with the help of ik handles, pretty straight forward and time saving. It is a blend of quite a bit of ribbon and number of IK handles. Very useful technique.

Rad the tutorial.