These are some resources and references I frequently find useful with regard to the psoas and creating easier movement in the whole body.
The WASHINGTON POST included a wonderful PDF in its article THE HEALTH HAZARDS OF SITTING. You can download that PDF here. http://www.washingtonpost.com/wp-srv/special/health/sitting/Sitting.pdf
The Surprising Secret To A Happier Low Back, Knees, Hips, Pelvic Floor & More
http://www.petrafishermovement.com/wanted-the-tight-psoas-for-causing-pain-in-the-lower-back-knees-hips-pelvic-floor-more/ (includes instructions for lovely, relaxing way to release the psoas)
​The 4 Diaphragms https://thescienceofphysicalrehabilitation.blogspot.com/2012/07/the-4-diaphragms.html , (includes a very cool video showing the psoas, internal organs and the movement of breathing)
VIDEO
Western Yoga with Peter Van Daam, a 9 minute series of movements that lubricate joints and activate circulation (blood, lymph, cerebral spinal fluid). Peter has produced a 90 minutes DVD that includes explanation of the movements, a nine minute session and a fifteen minute session. Available at http://www.arecatalog.com/ProductCatalog/Product/2117/Western-Yoga-For-All-DVD
List of exercises done in Western Yoga with Peter Van Daam: https://docs.google.com/document/d/1ytixPsmYkIONIGyHkFyD9068NeHsve5D2o971uxrkgs/edit?usp=sharing
Miranda Esmonde-White, mini routines from AGING BACKWARDS https://www.youtube.com/watch?v=ElzhxWoAEhM&list=PLrAxHkwmCdUcIzvI8gBfem81EU-C6fi9b
BOOKS
Move Your DNA: Restore Your Health Through Natural Movement Expanded Edition, Apr 24, 2017 | by Katy Bowman
Simple Steps to Foot Pain Relief: The New Science of Healthy Feet, Sep 6, 2016 | by Katy Bowman
Undulation: Relieve Stiffness and Feel Young, Nov 14, 2016 | Kindle eBook by Anita Boser and Mary Bond
Aging Backwards: Updated and Revised Edition, May 8, 2018 | Kindle eBook, by Miranda Esmonde-White
Forever Painless: End Chronic Pain and Reclaim Your Life in 30 Minutes a Day Nov 15, 2016 | Kindle eBook, by Miranda Esmonde-White