Losing weight through exclusively exercise is sooner to destroy your body then it is to actually be effective. Just a disclaimer, you certainly can do so, but the ratio of exercise to burnt calories is really inefficient. Weight loss is majority attributed to diet, calories in calories out so to say. Exercise does burn calories, but you also need calories to develop muscle, in which case you’re already better off eating a balanced diet that takes into account the amount of calories you burned through exercise and your basal metabolic rate to maintain a steady calorie deficit to lose weight while not destroying your body at the same time.