My experience with workout DVDS is that they are a great complement to a good diet for staying in shape. And, by a good diet, I mean permanent changes and not any of these quick weight loss scams. Any quick loss of weight is very unlikely statistically to last long term. I would also be extremely skeptical about weight loss, in particular since when you exercise you are building muscle which is heavier than fat. What you should notice (if you make the diet changes, as well) is that your close will become looser - that's a much better measure of success than the scale.