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Anchor a band to a sturdy object and lie faceup on the floor with your head nearest the anchor point, far enough away that the band will be taut when you grab each end of it. Your knees should be bent and your feet planted. Hold one end of the band alongside each ear, palms facing in, elbows pointing forward, and slowly curl your upper body off the floor, feeling the resistance of the band as you raise your shoulder blades. Think about shortening the distance between your pelvis and lower rib cage by contracting your abs as strongly as possible. Hold the top for a one-count, then slowly lower yourself back to the start.