The answer to this question really depends on what you mean by the loss of stomach fat. For some people lose 20-25 pounds from your belly is enough, but for others the loss of belly fat means getting washboard abs. If your goal is just to lose a small amount of fat, then you can do no exercise.
But if your goal is to lose a lot of fat, then exercise haste be part of his plans. Quite often people are afraid to go to the gym and exercising in front of everyone because they think others make fun of them.