This 360* Corethe central part of your body. It includes your pelvis, lower back, hips and stomach. The stomach muscles sometimes are called abs. More Workout uses Dumbbells to get at all directions of Core Strength. Have a set of heavy, medium and light dumbbells on hand so that you can choose the appropriate amount of weight for each movement and adjust as necessary. The warm-up and first circuit is done standing while the second circuit and stretch are done on the floor.