get rid of those

Such a scary sight! My belly fat that is ! I am not posting any pictures of course. I saw the shocking truth when I was trying out a fitted dress last week. My belly fat is too obvious , I think I need to do some sit ups to one down those tummy muscles. Can you suggest other activities to get rid belly fat ? I am so pressured now because we are hitting the beach next month so I want to have a better tummy by then . I envy my sister because she got slimmer lately even if we are pigging out whenever we are at the mall. Oh well. I really need to work out or else I will end up with this big tummy !