1. Using a roller, lie on ground, hips elevated beneath sacrum, lift legs to ceiling.
2. Lower one leg to floor one leg at a time, and then lower both legs.
3. Do not arch back. The moment rib cage expands or changes, stop, bend knees toward chest, and lift to starting position.
4. Vary legs for additional challenge, and finish with isometric hold. Keep rib cage “closed” abdominals engaged.
5. Do not hold breath.