We've all been guilty of sucking in our stomach to get into an exceptionally tight pair of pants or as we pose for a picture, but did you know that the "vacuuming" motion is actually helping work your abs? It's called the Stomach Vacuum, it's a tummy-tightening MVP, and a helluva lot easier than 2,000 nightly crunches.
More Fitness On: How to Master the Inner-Ab Vacuum
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