I have read many articles on losing belly fat and not one mentioned the tummy trimmer. Tummy trimmers are an ingenious invention and they help you burn fat and lose weight without any effort. But anyone who has used a tummy trimmer will know that it looks ridiculous and you might be the laughing stock of the gym, but well the machine works, so ignore the others. Other than that belly dancing and hoola hooping are good stomach exercises. In fact they are good cardio exercises as well. Try all of them out and see what works for you. Cheers!