Most effective exercise to lose belly fat?

Any: Exercise in general, coupled w/ diet, helps you lose belly fat. A combo of too much of the wrong kinds of carbs & not enough active muscle tissue is what sets up belly fat. It's added to by age, hormones & stress. Spot reducing exercise can make belly muscles stronger & shapelier, but you won't see them until the calories come down & your other muscles are toned & gobbling up glucose.