So, what you're saying is that with diet and exercise, this surgery can help you lose weight. Kinda like those crazy diet pills that say they'll make you lose weight
in conjunction with diet and exercise? Do you notice that the consistent feature here is diet and exercise? Yes, it will be difficult to lose the weight and keep it off, but it is by far the healthier way to do it.
And no, I don't think your heart will automatically get stronger by getting the lap band. It won't have to work as hard, but it won't get any stronger. As an extreme comparison, look at Lance Armstrong. His heart beats at 40 bpm because it is so strong from his training that that's all it needs to pump blood through his body. He didn't get it that strong just by being skinny. It also won't strengthen your body. I might be fat and out of shape, but I can still overpower people who are thinner than I but don't do the same work I do. I move large heavy things on a regular basis here at work and when horsing around with friends, I still overpower most of them. I just tired faster.