New Book – The Core of the Matter: Releasing the Iliopsoas and Quadratus Lumborum

My new book, The Core of the Matter: Releasing the Iliopsoas and Quadratus Lumborum is almost here.
This book gives you the tools and strategies to restore power, ease, and fluidity to the low back and pelvis. When these muscles becomes unable to perform their stabilizing duties due to injuries, poor posture, extended stints of sitting, or stress, they can alter the biomechanics of the pelvis and lumbar, thoracic and even cervical vertebrae. Discover gentle, effective, and new deep tissue protocols for releasing these muscles using Peggy’s original and innovative Muscle Swimming approach.

“If you are a results oriented practitioner, this is the book for you. Ms. Lamb has once again masterfully condensed the broad field of somatic work into its most effective distillate.  She provides wonderful clarity and insight into an often little understood anatomy of this area of the body.” Tracy Firsching, LMT

Four Functions of the amazing Rotator Cuff


1. Stabilizes the head of the humerus during all shoulder joint movements.
2. Counteracts the upward pull of the deltoid during abduction and flexion of the humerus by exerting a downward pull on the head of the humerus.
3. Decelerates the arm when you throw something or swing a golf club, etc.
4. Provides movement: internal/external rotation and abduction of the humerus.

These are busy muscles that are constantly multitasking!


The sub-occipitals set the tone for the para-spinals (erector spinae, multifidi, rotatores) so release them early in your bodywork sessions.