text: Some people who exercise may compensate for the burned calories by eating more (consciously or unconsciously).  Or, they may not be burning as many calories as they think while exercising.  Keep a food diary, writing down everything you eat, even the bite of a donut you steal from your friend.  Do this for a week.  You may surprise yourself.\nIf your gym offers personal trainers, take advantage of this.  The trainer can give you pointers on what you may need to change in your routine.