Postural or core stability muscles are the deep muscles in your abdomen, pelvis and back. They act as a corset or scaffolding holding you together rather than moving your trunk. It is important to have good postural muscles to help maintain a good posture.
In the abdomen there are four layers of muscles. The deepest layer, called transversus abdominis, is a band across your low stomach that holds the trunk together. The top layers help to bend and twist the trunk.
The postural muscles only work properly if the body is in a good posture or correct alignment. If not, a vicious cycle can develop.
Having weak postural muscles is like having a house with unstable foundations. You need strong foundations to stabilise your body.
|Long weak postural muscles in abdomen and front of neck||Short, tight low back muscles and muscles back of neck|
This can result in pain, fatigue and affect balance
Muscles that hold/stabilize the arm onto the trunk
Think of your arm as a crane and the shoulder blade, the base of the crane. Just as it is important for a crane to be on a stable base for it to work properly, it is important for the muscles around the shoulder blade to be strong to help anchor the arm to the trunk/ chest wall for it to work efficiently.
If these muscles are weak, it is often difficult for you to lift your arm up fully. The muscles on top of your shoulder tend to over work causing hunching when you raise the arm and, as they aren't designed to stabilise your shoulder, they get tired quickly and ache. This can make it harder to use your arm.
Sitting up straight, gently squeeze your shoulder blade down and back before raising your arm or reaching forward. You should find it is easier to raise your arm like this.
Last updated: October 2017
Last reviewed: December 2016
This page will be reviewed within three years