Benefits include Reduced mortality rates, even for smokers and the obese Preservation of skeletal muscle strength, aerobic capacity, and bone density, contributing to greater mobility and independence Reduced risk of obesity Prevention and treatment of cardiovascular disorders (including rehabilitation after myocardial infarction), diabetes, osteoporosis, colon cancer, and psychiatric disorders (especially mood disorders) Prevention of falls and fall-related injuries by improving muscle strength, balance, coordination, joint function, and endurance (1) Improved functional ability Opportunities for social interaction Enhanced sense of well-being Possibly improved sleep quality Physical activity is one of the few interventions that can restore physiologic capacity after it has been lost.