This video is a helpful tool for teaching appropriate abdominal connections on a curl-up; specifically maintaining a rib cage connection through the "upper abs" (Rectus abdominis) on the lowering phase (eccentric control) as well as a neutral pelvis position. The movement patterns are smooth, coordinated, and controlled. Also, spinal flexion is minimal...this is not a full crunch placing huge forces through the spine but rather essential stabilization while strengthening the abdominal wall. Pilates minimizes repetitions and emphasizes quality of movement. Even though this video is intended for instructors we all can apply the basic concepts to our core training regimens. I have been fortunate enough to attend a number of Tom McCook's educational workshops...he is an exceptional man and instructor.