Place feet under low overhanging stationary object. Lie supine on floor or mat with hips and knees bent. Hold plate behind neck with both hands.
Flex and twist waist to one direction while raising torso from bench by bending hips. Return until back of shoulders contact floor or mat. Repeat to opposite side alternating twists.
Feet can be held down by partner instead of foot bar. Exercise can be performed without added weight until more resistance is needed. Add more weight or perform on incline board to increase resistance. Also see Arm Position During Waist Exercises. Certain individuals may need to keep their neck in neutral position with space between their chin and sternum. Also see exercise with weight placed on chest. If upper back does not come completely down at end of movement, abdominal muscles may only be isometrically involved in exercise. Pectineus, Adductor Longus, and Brevis do not assist in hip flexion since hips are already initially bent. See Spot Reduction Myth.