I've read that stomach vacuums are excellent for shrinking your waistline. Just thinking through it logically, your waistline must shrink because you habitually suck in your abs, not because you have less abdominal fat.
So if my goal was a six pack, would stomach vacuums even be beneficial? [b]Wouldn't stomach vacuums just reverse the effects of low-rep ab training, which increase abdominal size?[/b] Anybody have experience with stomach vacuums?