The mantra to a healthy body weight is a healthy lifestyle. If you are aiming at losing weight, it is important to calculate your current BMI and the target BMI. The target BMI should be in a healthy range. Exercising with adequate intake of calories is a healthy way of losing weight. Aside indulging in moderate amounts of physical exercise it is also essential to maintain a healthy diet plan. A healthy diet should consist of adequate amounts of carbohydrates, proteins, fat and plenty of fruits and vegetables to supply vitamins and minerals. Start with a healthy breakfast, moderate lunch and light dinner. I would also suggest a change in your exercise regimen. You may rotate between a gym, swimming, yoga, aerobics, jogging, cycling etc. Also keep a track of calorie intake and your work out. If still your weight does not seem to budge, I would suggest consulting a physician to rule out hormonal or endocrine abnormalities which may result in increased weight. If any abnormality is found, it would be treated appropriately.
Hope this helps.