Years of on an off aching in my hip area after a gymnastics injury as a teen explained, and resolved in 2 weeks, while doing easy pleasant exercises from this book. I can do these exercises now while sitting and watching the weather on TV, and also as a passenger on car rides.Laying in bed in the morning, and before sleep. No need for extra gym membership, or outfit.Liz Koch, I want to thank you for putting this amazing information together. In 2 weeks I have grown almost an inch as the tight psoas muscle released my full height. The several simple exercises requiring no equipment beside our own body are brilliant. Doing them 1x daily and then paying attention to the psoas muscle every now and then is unwinding decades of stress from my body. I noticed that I smile more often, and I breathe with more ease.This is a book I highly recommend to anyone who has suffered from back pain, poor posture, feeling of shallow breathing,or belly sticking out from a fairly athletic body. I am a professional in body aligment field. A client told me about The Psoas Book about 3 years ago. It was on my wish list about 2. Don't wait as long as I did, reap the benefits now.