If you're planning on losing weight, a healthy diet is the most important thing, even more important than exercise. You can always lose weight if you eat healthy, and don't exercise, but you can't lose weight by eating poorly, and exercising. Weight loss is truly based on a good diet plan, so you must plan your carbs, calories, and food intake, daily. If this is done correctly, you'll lose weight, and you can lose even more, if you add some exercise.