Lie on left side, legs together, feet stacked. Wrap right arm around waist. Keep head and neck aligned with spine.
Prop upper body on bent left forearm (be sure elbow is directly below shoulder). Press hips toward ceiling, using abs to stabilize torso. Hold for 30 seconds and work up to 1-3 minutes.
Be sure not to hold breath. Exercise will be easier if feet are staggered instead of stacked.
Muscles Worked: Abs, Obliques