Sit-ups strengthen the abs, but they are ineffective for weight loss because they burn few calories. To lose 30 pounds in a month, create a caloric deficit of 105,000 calories through cardiovascular exercise and healthy eating.
To lose 1 pound of fat, a caloric deficit of 3,500 calories is required. Losing 30 pounds of fat in a month requires a caloric deficit of 105,000 calories. Aerobic exercise burns significantly more calories than sit-ups. To lose weight, engage in at least 30 minutes of cardiovascular exercise, five days per week. Gradually increase the intensity of the workouts. In addition, eat a reduced-calorie diet consisting of vegetables, whole grains, low-fat dairy products and lean meats.