Lie supine on mat or floor with bent leg and arms pointed up.
Flex waist to raise upper torso from floor. Return until back of shoulders contact padded incline board. Repeat.
Hip may move slightly during exercise. Exercise can be performed with added resistance if needed, by holding weight above. Quadriceps were not listed under stabilizers since they are not under significant resistance. Certain individuals may need to keep their neck in neutral position with space between their chin and sternum. See Arm Position During Waist Exercises and Spot Reduction Myth.