If you want some gentle smoothing and light control under something clingy, they are very nice indeed. They won't, however, replace weeks/months of situps. I tried them after I went wedding dress shopping and was horrified that I had become 'thick-waisted'. Lets just say an hourglass I was not - with or without the Spanx!
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To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment ~ {Ralph Waldo Emerson}