Try not to focus on a bodyweight goal. The trick is to focus on a body composition/appearance goal. Yes, we all want tighter stomachs and go about doing a ton of cardio thinking this is the best avenue to get there. Unfortunately, cardiovascular exercise only elevates your metabolism during the session until no more than 1 to 1.5 hours after you are done. However, you will benefit greatly from resistance training because every pound of muscle you put on will consume an extra 50 calories per day not to mention that weight training elevates your metabolism for eight or more hours after your session. This will accelerate your metabolism so as to burn more fat and the net effect is a smaller waistline. Besides the more mass you put onto your chest/shoulders/back the more you will shift the focus from your stomach thereby de-emphasizing it. The big gut will shrink quickly as you shift your diet towards calorie reduction because a lot of the girth in the gut comes from large amounts of food in perpetual digestion. So, eat lighter, do some running and hit the weights. You'll see a transformation quickly.