Wendy walks Katie through the elements of the spine twist. I love the imagery of going up a spiral staircase. The spine lengthen and rotates. This exercise focuses on the rotation of the thoracic spine. Often, when people first try this exercise, they are not able to separate the rotation in the pelvis. You can tell when one leg gets longer than the other that the rotation is coming from the pelvis. Katie learns how to spiral up out of the thoracic spine and keep the pelvis stable.