Strengthen the core and engage the obliques while working the lower body in the Warrior Crunch.
Begin by standing with feet slightly wider than shoulder-width, and toes turned outward. Place the finger tips behind the ears, keeping the back upright and the arms and chest open. Then lower down into a squat until the thighs are parallel to the ground. Once in this position, crunch side to side, bringing the elbows to the tops of the thighs, engaging the obliques.