I do somewhat but not to much... The fat is still there regardless, so all the tensing up really is not going to help that much...I like to take a mild diuretic before a body comp just pull some water off my lower abdominals....
The body fat checkers are completely innacurate. But just make sure and use the same tool and do everything the same each time you test. This will tell you if you are going up or down.
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