Fab abs are as easy as 1-2-3-4.
OK, well it's not that easy. But these are some good tummy tightening moves worth trying.
It's true that you can't spot reduce per se, but the four abdominal exercises explained in the link above will strengthen your core and, with proper diet and cardiovascular exercise which burns body fat, will yield a tighter tummy. More importantly, strong abs help reduce low-back pain which at least 1 in 4 adults suffer from at some point during their life.
So, whether you want to look better in a bathing suit or stave off low-back pain, it is worth incorporating these four moves into your exercise program.