Lie supine on mat with lower legs on bench. Place hands behind neck or head.
Flex and twist waist to raise upper torso from mat to one side. Return until back of shoulders contact mat. Repeat to opposite side alternating twists.
Leg elevation keeps pelvis tilted back keeping low back on mat. Certain individuals may need to keep their neck in neutral position with space between their chin and sternum, particularly with their hands are behind their heads. See Spot Reduction Myth.
Movement can be made by crossing arms on chest.
Exercise can be made more challenging by placing hands further up on or beyond head. See Arm Position During Waist Exercises. Exercise can also be performed on incline board or with additional weight.