Exercise is a good component to add as one aspect of achieving a healthy lifestyle. As a cornerstone of a weight loss program, it's not very useful. As long as you can eat more calories in 5 minutes than you can burn in two hours on the treadmill, and almost anybody can (and does) do that, dietary management becomes by far the most important part of the necessary lifestyle changes.
Very few people can effect those lifestyle changes without help, primarily having some kind of structured framework to follow. Nutritionist, personal trainer, Weight Watchers, whatever....your odds of success are higher. Otherwise, you will absolutely most likely end up just another yo-yo dieter.
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