Whether you use a pill or jab or neither, exercise exercise exercise! It will increase quality of life and reduce risk factors for lots of causes of death as you get older.
Exercise is great and I wish more people could find the time to do it, but exercise won’t lead to weight loss if people don’t change the horrible diets that got us here in the first place.
Weight loss shouldn't be the end goal. Health and fitness are what make life longer and more enjoyable. But it happens that excess weight inhibits health and fitness too. A skinny person can be unhealthy and unfit too.