Core stability relates to the bodily region bounded by the abdominal wall, the pelvis, the lower back and the diaphragm and its ability to stabilize the body during movement.
The main muscles involved include the Transversus Abdominis, Multifidis, and the diaphragm a few to name.
The diaphragm is the main muscle of breathing in the human and so breathing is important
in providing the necessary core stability for moving and lifting. It is the action of these
muscles contracting together upon the incompressible contents of the abdominal cavity(ie the internal organs or viscera) that provides support to the spine and pelvis during movement.
Core stability training is one of the most essential parts in any fitness programme, otherwise it is like trying to build on sand. Core Stability Training is essential for better posture, sports performance and free from back pain and injuries.
By developing a strong core, you are going to develop all round strength and become better in any given exercise and movement.
Learn How to Engage your core here: www.tips4results.blogspot.co.uk/2014/04/core-muscles-how-do-i-know-if-i-am.html
Video here: www.youtube.com/watch?v=lmdPovEPUZM&list=UUnfEjLlpMrB5Nv-Lse_mFwg
See also XFit Core Classes read more... and Pilates read more...