For others who need to look up what a Stomach Vacuum [1] is [1] http://www.bodybuilding.com/exercises/detail/view/name/stomach-vacuum http://www.bodybuilding.c

For others who need to look up what a Stomach Vacuum [1] is [1] http://www.bodybuilding.com/exercises/detail/view/name/stomach-vacuum http://www.bodybuilding.com/exercises/detail/view/name/stoma...