You'll need to combine diet with exercise for the best results.
No one wants a stomach pouch hanging over their pants and interfering with a beach-ready body. A variety of factors -- including diet, activity level, body type and genetics -- can conspire to cause you to develop a flabby stomach. It might not be possible to lose all of the weight in three months, particularly if you need to lose more than a few pounds. However, with a meticulously crafted diet and exercise routine, you can be well on your way to a slimmer stomach.
Keep a food log for several days to determine how many calories you eat each day. Weight loss will be much easier if you eat less than the number of calories you need to maintain your current weight. Your doctor can help you determine your basal metabolic rate, which is the minimum number of calories you need to maintain your weight.
Trim excess calories from your diet. You don't have to starve yourself. Instead, the key is to develop a healthy diet that you can sustain for the long-term. Ensure your diet is rich in veggies, fruits, lean proteins and whole grains. Consult your food log to see if you're eating any nutritionally empty, high-calorie foods such as soda, cookies, alcohol and potato chips. Cutting just a single unhealthy food from your diet can help you reduce your daily caloric intake by 100 calories or more.
Incorporate cardiovascular exercises such as rebounding, step aerobics, running or bicycling into your daily physical fitness routine. These exercises burn more calories than situps and crunches, and you can't spot-reduce fat from your stomach anyway. More intense exercise that elevates your heart and breathing rates will help you burn more calories, so aim for as much intensity as you can do -- and that your doctor says is safe. For maximum benefits, the Centers for Disease Control and Prevention recommends 300 minutes of cardio a week.
Find ways to become more active throughout your day. Active people burn more calories, and a few calories here and there can add up to a few pounds over three months. Try wrestling or playing fetch with your dog, walking to your destinations instead of driving, taking five-minute stretch breaks for every hour you work and taking brief walking breaks throughout your day.
Supplement your cardiovascular exercise routine with stomach exercises. Targeted exercises can help you burn muscle, which in turn will help you burn more calories. They'll also help your stomach look more toned as you shed the fat. Try routines such as the bicycle crunch, captain's chair, reverse crunch and crunch on an exercise ball, which a 2001 American Council on Exercise study found to be the most effective ab exercises.
For every pound you need to lose, you'll have to trim 3,500 calories through diet, exercise or both.