Stomach Vacuum

To execute the Stomach Vacuum, stand upright and place your hands on your hips, and exhale all the air out of your lungs, completely. Expand your chest, and bring your stomach in as much as possible, and hold. Visualize trying to touch your navel to your backbone. One isometric contraction of "20" seconds is one repetition. You can work your way up to 40 or 60 seconds