Relax, we are not going to pump or vacuum your stomach. The Stomach Vacuum is an isometric contraction (tenses the muscle without moving it) of the Transversus Abdominus. A stronger Transversus Abdominus can create a stronger Valsalva Maneuver (the powerful exhale necessary to contract a muscle during an intense workload). This is one of the best exercises you can perform to shrink your waistline in a very short amount of time. Many can knock 2 to 4 inches off their midsection. ~ Berceste