Please let me refer you off my site to CoreAwareness.com with Liz Koch. I'm really excited about her work and she can tell you the best.
The tone of the large psoas pair can have an effect on the descent of the baby and even fetal position.
What: The psoas (so-as) is a large pair of muscles from the spine between the pelvis and the ribs that wrap like cradling wings around to the front of the pelvis and drop down to attach at the lower end to the top of the thigh bone. They help us walk upright, support our abdominal organs.
Why: We "release" tension stored in the psoas for optimal body function. Liz Koch calls it hydrating the psoas or here, unraveling it. There are ways to restore the psoas while pregnant that may not involve so much inversion... But I put this here to really open up our awareness of our bodies in a very new way for most of us. You'll learn a lot from listening to Liz narrate this adventure. She talks about asymmetry in a different level than I use the word. I don't find a conflict with the difference, I find a higher examination of the body. Liz Koch can take you there.
When: At any time. In pregnancy and during labor. Before or after pregnancy, for all.
|"...why is the Psoas so important during pregnancy, birth and postpartum? Because for a woman, her pelvis is the cradle of civilization. It needs to be lush, centered, and dynamic. The Psoas, spoken of as the muscle of the soul in Daoist healing traditions, holds the key for accessing instinctual wisdom so essential for a resilient natural birth process. On a very functional level, maintaining or regaining a healthy Psoas relieves or eliminates low back and leg pains, opens and centers the pelvic and hips, and can help you avoid induction. On every level understanding the message of the Psoas resolves the fears of birthing and empowers babies to emerge whole-hearted." --Liz Koch at www.CoreAwareness.com|
How: Several activities and generally good posture and breath.
Here is a link by Collette Crawford interviewing Liz Koch and includes a shout-out to Spinning Babies, http://breakingmuscle.com/womens-fitness/training-natural-birth-dont-forget-your-psoas
Here is a link to Liz Koch's favorite Yoga activities for releasing the psoas, http://www.yogajournal.com/practice/169
When not to: Can't think when!
Before: Before doing these exercises, find a moment with peace to set up a little space and time to do them without a busy mind distracting you from your perceptions.
Next: After doing these exercises you will feel more relaxed and centered. Keep the breath flowing and repeat the exercises as needed. A resolved psoas is life changing for all as well as advantageous for the pregnant and birthing woman.