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Forget those little bitty crunches and "going for the burn." Real core exercises like old fashioned bent-legs sit-ups, wood choppers with weighted cables, and windshield wipers (no equipment needed) are the real way to a stronger, firmer gut.
If you're a beginner, enter slowly. Use the bent-knees side to side motion first. Then graduate to straight legs once you get the hang of it. Work up to a few sets of 20 and feel the muscles of your trunk get stronger and a whole lot firmer.
Do them with control, always. And breathe smoothly.