While injuries can surely occur, you can easily undergo physical therapy in NYC to recover from an injury. Just imagine developing the opposite effects of those listed above--fat buildup instead of fat loss, for example.
You do not have to be a spry, healthy teenager in order to be good at sports. Of course, the term "sports" is broad, but for the most part, they involve intense physical activity or at least a light amount of exercise. The learning curve that comes with practicing a sport gives you a sense of accomplishment