3) Rib Cage Placement 
In the rest position your rib cage should be aligned with your pelvis.  You should be able to feel the back of your rib cage resting on the mat.  Place your thumbs at the bony edge of your ribcage, finger tips on your pelvic bones – imagine two springs running down your sides from the ribs to the pelvis – the springs act to keep the same distance between the rib cage and your pelvis during movement.

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