Exercise and aging: extending independence in older adults.

Exercise plays an important role in enhancing the quality of life of the older patient, although studies have shown that regular physical activity does not significantly lengthen life expectancy. Improved physiologic and psychological function helps to maintain personal independence and reduces demands for acute and chronic care services. This has significant economic benefits, as the resultant cost savings will likely cover the costs of a well-designed exercise program. Primary care physicians can help older patients to realize these benefits by encouraging them to increase their physical activity and by prescribing appropriate exercise regimens.