Your core is the hub of your body and the main power source for the movements you make.
It's a 360 powerhouse, that runs from your armpits to your knees.
In the chakra model of Yoga, it is associated with your 3rd chakra called manipura, roughly located around your solar plexus. This energy center has been associated with your sense of self, empowerment and your ability to take action.
So one of the BEST investments you can make in yourself is keeping your core center balanced and strong. This practice in activates all parts of your hub in many different ways and you'll emerge feeling SOLID GOLD.