It is something we have all heard for years: Exercise can help keep older adults healthy. But now a study, the first of its kind to look at frail, older adults, proves that physical activity can help this specific group maintain their mobility and dodge physical disability. A new University of Florida study shows daily moderate physical activity may mean the difference between seniors being able to keep up with everyday activities or becoming housebound. In fact, moderate physical activity helped aging adults maintain their ability to walk at a rate 18 percent higher than older adults who did not exercise. The results are published in the Journal of the American Medical Association.