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I will lose an average of 0.6kg a week. This means I will lose 7.2kg in 12 weeks. I will weigh myself weekly to keep myself on track. This is a healthy weight loss per week, and is more than achievable as long as I maintain healthy eating habits and exercise. So by the end of March I will be 7kg lighter, and will have lost cm's from all over my body, which is an exciting & realistic goal.
Think about HOW your eating and exercise will change to achieve this. It may be that you need to look at total calories (Calorie King is great for this: Google it!). Or it may be that you are committed to joining Weight Watchers. Or doing one of the many "shake" programs. Or it may be that you simply need to cut out junk food and grog? Each circumstance is different. So make sure you know how YOU are going to tackle this.