This exercise comes from the postural restoration institute (PRI). Its purpose is to help restore neutrality in the body to help offset our asymmetrical tendencies. It can be a very useful tool for someone with low back pain, hip pain, shoulder pain to name a few. When performed correctly you should feel both hamstrings engage (left > right), a left adductor, your left abs, and a right glute muscle. Hold this position as you focus on proper breathing mechanics. If able, a balloon can be added to the exercise to ensure proper breathing mechanics are being utilized.
About the Author: Dr. Greg Schaible is a physical therapist and strength coach specializing in athletic performance. He attended The University of Findlay as a student athlete. As an athlete he competed in both Indoor and Outdoor Track & Field where he earned honors as a 5x Division II All-American and 6x Division II Academic All-American. In 2013 he completed Graduate School earning his Doctorate of Physical Therapy (DPT). Greg is the owner of On Track Physical Therapy in Ann Arbor, Mi. Follow On Track PT and Performance on Facebook.