Strength building core finisher workout BodybuildingExercisesNutritionWeight loss by Brantb - 18th January 201818th January 20180 A strong core will support everything else you do, but when most people think of core they only think of abs. Head trainer Alexa Towersey and Jenna Douros show us how to build up your core.The core includes all of the abs (deep and superficial) in addition to the muscles of the hips and lower back. These four exercises are designed to target as much of the core as possible.