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The 'almighty' psoas muscles: your body's centre of movement

The foundation of our bodies and our yoga practice lies at our feet.
In order to incorporate both physical and energetic foundations, we must examine our body's centre of energy, movement and balance which begins near the psoas muscle -- the pair of deep muscles extending from the sides of the spine to the femur that are activated in postures like forward bending (paschimottanasana) and lengthened in poses like Warrior I and Bow.
To understand the psoas muscles, we first need to describe some of the surrounding structures. Imagine looking at a body  from the front (anterior) then stripping the skin away (yes, a bit gruesome). Peel away the layer of muscles over the abdomen and then remove the organs.
You'll now be looking at the front of the spine with its large vertebral bodies sandwiching those sometimes not-so- happy, but very  important discs. You're now looking at your back/spine  from the front.
Looking down a bit you see the inside of  your bowl-shaped pelvis with your sacrum towards the  back and the pelvic floor muscles in place connecting from it to your pubic bone. Lying over the front, and to  the sides of your pubic bone, is a thick muscle that heads up to the sides of your vertebral bodies and  drops down to connect to a spot on the inside and back of your thigh bone (femur). This is the almighty psoas.
The psoas gets a lot of attention, and for good  reason. Roughly triangular in shape, the top of the psoas
attaches along five vertebral bodies starting at the last thoracic vertebrae (T12) and  continues to attach to each vertebral body, usually terminating at the next to last Lumbar vertebrae (L4). This completes one side of the triangle. From the ends of this side, we create two more sides that slowly come together and attach at that spot on the femur.
Because the psoas is triangular, the different portions of the triangle can have a different effects on the spine, and therefore the body. Usually  when we describe a muscle and the action that it does we talk about the bone that it makes move, in this case, the femur. The psoas insertion is on the femur. Movements happen at joints, so whichever joint is crossed by the psoas has the potential to be moved by this muscle. With the spine stabilized, as it mostly is, the psoas makes us perform flexion at the hip joint as in a forward bend. What happens
if we stabilize the femur? Can the psoas then move the spine? You bet, and at this point we've reversed the origin and insertion.
If we stabilize the femur, the upper half of the triangle has the potential to pull the spine down and forward as it
attaches to the last thoracic vertebrae. The lower half of the psoas pulls mostly on the lumbars and therefore pulls them down and forward which would makes the pelvis tip forward and down. This sometimes shows up as a sway back.
If you stand up and tilt your pelvis down and forward you'll probably feel how short your low back gets. Back
pain anyone?
How does the psoas show up in our yoga practice?
Probably the most powerful place is in back bending in all variations such as Cobra, Bow, and Camel where we lengthen and open the front of our bodies, and important action that reverses most of what we do all day: sitting, driving, working on the computing etc... A tight psoas, along with other muscles make back bends very difficult. When back bending, it's often a good idea to tuck your tailbone (the opposite of the action described above). This will give length to your lower back. Yoga is about creating length in your body; find it wherever you can in your poses.
Aside from back bending, the psoas muscles are commonly used in forward bends to pull you down and forward. All too often people rely on their arms to pull them forward.  Because the psoas also helps regulate balance, it is used in every standing posture to stabilize the upper and lower half of the body. Our centre of gravity is roughly at the top of our sacrum, and psoas just happens to pass on both sides of this sacred bone so it helps regulate balance around our centre of gravity which is where movement comes from.

Chakras, Bhandas and Fred Astaire

If you look at the space between the top and the bottom of the psoas, you will find some interesting pieces of yogic anatomy. Within its' span are the lowest three chakras which control our instincts for survival, sexual energy and power. If you incorporate bandhas (internal energetic valves) into your practice you'll find the mula and udhiyana bandhas within the realm of the psoas. If you come from this place, both physically and energetically, you will have an amazing practice. An example of someone who moved from this space is Fred Astaire who gingerly floated a few inches above the ground as he danced. His movement originated from his psoas. I doubt that he was consciously aware of it, but his movements emanated from his psoas to his toes and
fingertips. I'm sure he didn't know it but he also utilized the bandhas and the energy to move his body. Just like any of the great yogis teaching out there now, Astaire mastered this area of his body and called on it regularly for strength and energy.

USING THE PSOAS IN SUN SALUTES

Let's do a sun salutation paying special attention to our psoas. With your weight evenly balanced on both feet, become aware of the space near the level of your navel.  Imagine finding length from your psoas as your spine lifts from your centre. Every time you inhale, feel yourself getting longer from your psoas and spine. Do your first
sun  salutation very slowly and imagine every movement growing and blossoming from this area of  your body. After you've done a few Sun Salutations, find your way into Warrior I. Sink into your legs and feel how grounded you are. From that very grounded and strong foundation lift your torso out and up through your psoas; your arms are reaching from your psoas, your spine and head growing longer from-- yes you got it-- your psoas.

David Keil, LMT

David Keil is a licensed massage therapist, anatomy instructor and ashtanga yoga teacher in Miami.
You can visit David on his website at www.yoganatomy.com