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If you mean you have "stubborn fat" in that area you want to get rid of, no exercise will specifically target that area (you can't "spot-reduce"). Fat reduction will come mainly from nutrition, though building muscle under the fat will be useful (revealed when the fat layer is thinner).
Dominique | Finland
Ionic, Aria, Flyer, TrendWeight | Windows 7, OS X 10.13.5 | Motorola Moto G6 (Android 9), iPad Air (iOS 12.4.4)
Take a look at the Fitbit help site for further assistance and information.