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This is a demo and explanation of costal breathing. The idea is to use the muscles located between the ribs to lift and expand the ribcage (when inhaling.) These same muscles relax when exhaling. Spinal erectors may also be active since they are being used to straighten the spine and then allowing it to bend forwards. Neck muscles are also involved. The idea of this breath is to breathe fully, keep and help to keep the ribcage and thoracic spine supple.
![](https://i.ytimg.com/vi/H7kDMcPTKE0/mqdefault.jpg)