Your original post was a statement as opposed to a question and we were offering our views for or against that statement. If you are happy dieting without exercising and want to keep going that way then fine - but for most people the longer you do this the harder the weightloss is to achieve.

If you have lost weight without exercising and have your diet in order but are having trouble losing the last 10 pounds - reached a plateau - then exercise can be beneficial. If you do between 30 and 60 minutes of aerobid activity (brisk walking, cycling, jogging, gym class) 4 or more days a week without increasing your calorie intake, the weight will come off. If you lift some weights on top of this, your lean muscle mass will increase and while you may not see any difference on the scales, your measurements will decrease.