What we all core is your body excluding your head, arms and legs. Simply put, it is your torso, inner and outer muscled which surround pelvic, spine, ribs and scapulae.
Function of Core:
1) Hold and protect inner organs such as lungs, heart and stomach in the right position ensuring they function properly (life support).
2) Support your body (posture maintenance).
3) Enable you to move your body freely (core strength).
The structure and function of core are composed by 3 layer of muscles.